Raising the right hand is common for taking an oath today, but it is rare in the Bible (compare Genesis 14:22; 24:9; Daniel 12:7).
When making an oath, Jews were careful not to use God’s name lightly (see Exodus 20:7). Jesus also corrected people who made oaths without sincerity (see Matthew 5:33–37; 23:16–22). When God made an oath, he used his own name, because there is no higher authority (see Genesis 22:16; Psalm 89:35–36; Jeremiah 22:5; Hebrews 6:13–18).