Exodus 23:19

The first of the first-fruits of thy land thou shalt bring into the house of the Lord, thy God. This refers to the festivals in general, for not only were the firstlings of the barley sheaves offered at Passover and two pentecostal loaves during the Feast of Weeks, but the people were expected in general to bring gifts of first-fruits to the Lord. Thou shalt not seethe a kid in his mother's milk, this practice being prohibited as unnatural and tending to make the feasting the central feature, especially in connection with the great festivals. The Old Testament Sabbath and festivals with their ordinances are no longer binding upon the Christians of the New Testament; yet God expects also us to thank and to praise, to serve and obey Him in true faith and love.