Only be strong and very courageous, being careful to do according to all the law that Moses my servant commanded you. Do not turn from it to the right hand or to the left, that you may have good success wherever you go. This Book of the Law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success. Joshua 1:7-8

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full passage:

After the death of Moses the servant of the LORD, the LORD said to Joshua the son of Nun, Moses' assistant, “Moses my servant is dead. Now therefore arise, go over this Jordan, you and all this people, into the land that I am giving to them, to the people of Israel. Every place that the sole of your foot will tread upon I have given to you, just as I promised to Moses. From the wilderness and this Lebanon as far as the great river, the river Euphrates, all the land of the Hittites to the Great Sea toward the going down of the sun shall be your territory. No man shall be able to stand before you all the days of your life. Just as I was with Moses, so I will be with you. I will not leave you or forsake you. Be strong and courageous, for you shall cause this people to inherit the land that I swore to their fathers to give them. Only be strong and very courageous, being careful to do according to all the law that Moses my servant commanded you. Do not turn from it to the right hand or to the left, that you may have good success wherever you go. This Book of the Law shall not depart from your mouth, but you shall meditate on it day and night, so that you may be careful to do according to all that is written in it. For then you will make your way prosperous, and then you will have good success. Have I not commanded you? Be strong and courageous. Do not be frightened, and do not be dismayed, for the LORD your God is with you wherever you go.” And Joshua commanded the officers of the people, “Pass through the midst of the camp and command the people, ‘Prepare your provisions, for within three days you are to pass over this Jordan to go in to take possession of the land that the LORD your God is giving you to possess.’” Joshua 1:1-11

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But I trust in you, O LORD; I say, “You are my God.” My times are in your hand; rescue me from the hand of my enemies and from my persecutors! ​Make your face shine on your servant; save me in your steadfast love! O LORD, let me not be put to shame, for I call upon you; let the wicked be put to shame; let them go silently to Sheol. Let the lying lips be mute, which speak insolently against the righteous in pride and contempt. Oh, how abundant is your goodness, which you have stored up for those who fear you and worked for those who take refuge in you, in the sight of the children of mankind! In the cover of your presence you hide them from the plots of men; you store them in your shelter from the strife of tongues. Blessed be the LORD, for he has wondrously shown his steadfast love to me when I was in a besieged city. I had said in my alarm, “I am cut off from your sight.” But you heard the voice of my pleas for mercy when I cried to you for help. Love the LORD, all you his saints! The LORD preserves the faithful but abundantly repays the one who acts in pride. ​Be strong, and let your heart take courage, all you who wait for the LORD! Psalms 31:14-24

“Now, my son, the LORD be with you, so that you may succeed in building the house of the LORD your God, as he has spoken concerning you. Only, may the LORD grant you discretion and understanding, that when he gives you charge over Israel you may keep the law of the LORD your God. Then you will prosper if you are careful to observe the statutes and the rules that the LORD commanded Moses for Israel. Be strong and courageous. Fear not; do not be dismayed.” 1 Chronicles 22:11-13

“If you say in your heart, ‘These nations are greater than I. How can I dispossess them?’ you shall not be afraid of them but you shall remember what the LORD your God did to Pharaoh and to all Egypt, the great trials that your eyes saw, the signs, the wonders, the mighty hand, and the outstretched arm, by which the LORD your God brought you out. So will the LORD your God do to all the peoples of whom you are afraid. Moreover, the LORD your God will send hornets among them, until those who are left and hide themselves from you are destroyed. You shall not be in dread of them, for the LORD your God is in your midst, a great and awesome God. The LORD your God will clear away these nations before you little by little. You may not make an end of them at once, lest the wild beasts grow too numerous for you. But the LORD your God will give them over to you and throw them into great confusion, until they are destroyed. And he will give their kings into your hand, and you shall make their name perish from under heaven. No one shall be able to stand against you until you have destroyed them. The carved images of their gods you shall burn with fire. You shall not covet the silver or the gold that is on them or take it for yourselves, lest you be ensnared by it, for it is an abomination to the LORD your God. And you shall not bring an abominable thing into your house and become devoted to destruction like it. You shall utterly detest and abhor it, for it is devoted to destruction. Deuteronomy 7:17-26