“They will eat the meal offering, and the sin offering, and the guilt offering, and every devoted thing in Israel shall be theirs. And the first of all the firstfruits of everything, and every gift of everything, of all your gifts, shall be for the priests. You will also give to your priests the first of your dough, to cause a blessing to rest on your house.”
God now makes provision for His dedicated priests. They may participate of meal offerings, and of the flesh of sin and guilt offerings (within the prescribed limits) - see Leviticus 2:3; Leviticus 2:10; Leviticus 5:13; Leviticus 6:18; Leviticus 6:26; Leviticus 7:6; Leviticus 7:9-10. Also anything dedicated to God by the people shall be theirs. These were "devoted" (Hebrew ‘herem') things, things given that the offerer could not redeem (buy back - see Leviticus 27:21; Leviticus 27:28; Numbers 18:14). And all gifts given to God would also be theirs. This would include the first of the dough. The result for the people who give will blessing on their houses.