Deuteronomy 15:19

Overview - Deuteronomy 15
The seventh year a year of release for the poor.
It must be no let of lending or giving.
12 An Hebrew servant, except he will not depart, must in the seventh year go forth free and well furnished.
19 All firstling males of the cattle are to be sanctified unto the Lord.
Treasury of Scripture Knowledge

Deuteronomy 15:19  (King James Version)
All the firstling males that come of thy herd and of thy flock thou shalt sanctify unto the LORD thy God: thou shalt do no work with the firstling of thy bullock, nor shear the firstling of thy sheep.

the firstling
Exodus 13:2 Exodus 13:12 ; 34:19 Leviticus 27:26 ; Numbers 3:13 ; 18:17 Romans 8:29 ; Hebrews 12:23

thou shalt do
Deuteronomy 12:5-7 Deuteronomy 12:17 14:23 Deuteronomy 16:11 Deuteronomy 16:14 Numbers 18:15