Numbers 18:26-29

²⁶“Tell this to the descendants of Levi: ‘When you receive one tenth of all the crops and animals from the Israeli people, you must give one tenth of all that to me to be a sacred offering.

²⁷Just like the other Israelis give one tenth of the grain and wine that they produce,

²⁸you must give to me one tenth of all that you receive from them. That will be your sacred offering to me. You must present it to Aaron.

²⁹Select the best parts of the things that are given to you to give them to me.’