You shall fear the LORD your God. You shall serve Him and hold fast to Him, and by His name you shall swear. He is your praise. Deuteronomy 10:20

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“And now, Israel, what does the LORD your God require of you, but to fear the LORD your God, to walk in all his ways, to love him, to serve the LORD your God with all your heart and with all your soul, and to keep the commandments and statutes of the LORD, which I am commanding you today for your good? Behold, to the LORD your God belong heaven and the heaven of heavens, the earth with all that is in it. Yet the LORD set his heart in love on your fathers and chose their offspring after them, you above all peoples, as you are this day. Circumcise therefore the foreskin of your heart, and be no longer stubborn. For the LORD your God is God of gods and Lord of lords, the great, the mighty, and the awesome God, who is not partial and takes no bribe. He executes justice for the fatherless and the widow, and loves the sojourner, giving him food and clothing. Love the sojourner, therefore, for you were sojourners in the land of Egypt. You shall fear the LORD your God. You shall serve him and hold fast to him, and by his name you shall swear. He is your praise. He is your God, who has done for you these great and terrifying things that your eyes have seen. Your fathers went down to Egypt seventy persons, and now the LORD your God has made you as numerous as the stars of heaven. Deuteronomy 10:12-22

“Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’ But I say to you, Do not take an oath at all, either by heaven, for it is the throne of God, or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. And do not take an oath by your head, for you cannot make one hair white or black. Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil. Matthew 5:33-37

But above all, my brothers, do not swear, either by heaven or by earth or by any other oath, but let your “yes” be yes and your “no” be no, so that you may not fall under condemnation. James 5:12

“A disciple is not above his teacher, nor a servant above his master. It is enough for the disciple to be like his teacher, and the servant like his master. If they have called the master of the house Beelzebul, how much more will they malign those of his household. “So have no fear of them, for nothing is covered that will not be revealed, or hidden that will not be known. What I tell you in the dark, say in the light, and what you hear whispered, proclaim on the housetops. And do not fear those who kill the body but cannot kill the soul. Rather fear him who can destroy both soul and body in hell. Are not two sparrows sold for a penny? And not one of them will fall to the ground apart from your Father. But even the hairs of your head are all numbered. Fear not, therefore; you are of more value than many sparrows. So everyone who acknowledges me before men, I also will acknowledge before my Father who is in heaven, but whoever denies me before men, I also will deny before my Father who is in heaven. “Do not think that I have come to bring peace to the earth. I have not come to bring peace, but a sword. For I have come to set a man against his father, and a daughter against her mother, and a daughter-in-law against her mother-in-law. And a person's enemies will be those of his own household. Whoever loves father or mother more than me is not worthy of me, and whoever loves son or daughter more than me is not worthy of me. And whoever does not take his cross and follow me is not worthy of me. Whoever finds his life will lose it, and whoever loses his life for my sake will find it. “Whoever receives you receives me, and whoever receives me receives him who sent me. The one who receives a prophet because he is a prophet will receive a prophet's reward, and the one who receives a righteous person because he is a righteous person will receive a righteous person's reward. And whoever gives one of these little ones even a cup of cold water because he is a disciple, truly, I say to you, he will by no means lose his reward.” Matthew 10:24-42