Genesis 28:20-22

Then Jacob made a promise. He said, “If God will be with me, and if he will protect me on this trip, and if he gives me food to eat and clothes to wear, and if I return in peace to my father’s house—if he does all these things—then the LORD will be my God. I am setting this stone up as a memorial stone. It will show that this is a holy place for God, and I will give God one-tenth of all he gives me.”