When God made his promise to Abraham, since there was no one greater for him to swear by, he swore by himself, saying, “I will surely bless you and give you many descendants.” And so after waiting patiently, Abraham received what was promised.
People swear by someone greater than themselves, and the oath confirms what is said and puts an end to all argument. Because God wanted to make the unchanging nature of his purpose very clear to the heirs of what was promised, he confirmed it with an oath. God did this so that, by two unchangeable things in which it is impossible for God to lie, we who have fled to take hold of the hope set before us may be greatly encouraged. We have this hope as an anchor for the soul, firm and secure. It enters the inner sanctuary behind the curtain, where our forerunner, Jesus, has entered on our behalf. He has become a high priest forever, in the order of Melchizedek.
Hebrews 6:13-20New International Version (NIV)
When the people saw the thunder and lightning and heard the trumpet and saw the mountain in smoke, they trembled with fear. They stayed at a distance and said to Moses, “Speak to us yourself and we will listen. But do not have God speak to us or we will die.”
Moses said to the people, “Do not be afraid. God has come to test you, so that the fear of God will be with you to keep you from sinning.”
The people remained at a distance, while Moses approached the thick darkness where God was.
Then the Lord said to Moses, “Tell the Israelites this: ‘You have seen for yourselves that I have spoken to you from heaven: Do not make any gods to be alongside me; do not make for yourselves gods of silver or gods of gold.
“‘Make an altar of earth for me and sacrifice on it your burnt offerings and fellowship offerings, your sheep and goats and your cattle. Wherever I cause my name to be honored, I will come to you and bless you.
Exodus 20:18-24New International Version (NIV)
Love must be sincere. Hate what is evil; cling to what is good. Be devoted to one another in love. Honor one another above yourselves. Never be lacking in zeal, but keep your spiritual fervor, serving the Lord. Be joyful in hope, patient in affliction, faithful in prayer.
Romans 12:9-12New International Version (NIV)