What does Genesis 28:22 mean?
Jacob concludes his vow before the Lord. In the previous verses, he has declared that if God does all He has said He would do for Jacob, then Jacob would make the Lord his God (Genesis 28:20–21). In addition, he now says that the stone he has set up for a commemorative pillar will become God's house. This stone was the very same one on which Jacob rested his head while sleeping in the wilderness (Genesis 28:16–18). In other words, Jacob would return to this place to worship the Lord.In a previous verse, Jacob renamed the place "Bethel," meaning "house of God." Bethel would continue to be a significant meeting place with God for Israel far into the future.
Jacob completes his vow with a promise to give to God a tenth of all God gives to him. Previously, Jacob's grandfather Abraham gave to God's priest Melchizedek such a tithe (Genesis 14:20). Jacob volunteers to worship the Lord in this financial way as well. Giving to God specific tithes and offerings was one of the ways Israel would later demonstrate their obedience to and dependence on the Lord.