Contradiction with Proverbs 3:5
Genesis 28:21 involves a conditional vow from Jacob to trust God if he returns safely, while Proverbs 3:5 advises unconditional trust in the Lord without leaning on one's understanding.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 4:7
Genesis 28:21 shows Jacob testing God with conditions, whereas Matthew 4:7 (quoting Deuteronomy 6:16) involves Jesus indicating it is wrong to test God.
Matthew 4:7: Jesus said unto him, It is written again, Thou shalt not tempt the Lord thy God. [tempt: or, try, or, put to trial, or, proof]
Contradiction with Matthew 6:31-32
Genesis 28:21 includes Jacob's conditional use of resources and safety, while Matthew 6:31-32 highlights trusting God unconditionally for these things since He knows our needs.
Matthew 6:31-32: Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed?
Contradiction with James 4:13-15
In Genesis 28:21, Jacob is making future plans based on his conditions; however, James 4:13-15 warns against making plans without acknowledging God's will, advocating instead for saying "if the Lord wills."
James 4:13-15: Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain: