Numbers 28:15
And one kid of the goats for a sin offering unto the Lord shall be offered, beside the continual burnt offering, and his drink offering.
Cross-reference
Numbers 28:3 commands the daily burnt offering, which the monthly sin offering here is offered in addition to.
Numbers 28:10 uses the same phrase 'besides the regular burnt offering' for the Sabbath, showing the sin offering for the new moon follows the same logic of addition.
Numbers 28:22 commands the same male goat sin offering for the Feast of Unleavened Bread — parallel requirement for another festival.
Numbers 28:30 also commands a male goat for sin offering at the Feast of Weeks, mirroring the new moon sin offering pattern.
Numbers 28:11 introduces the new moon burnt offerings that verse 15 concludes with the sin offering, providing the immediate context.
Numbers 29:5 likewise prescribes a male goat for sin offering at the Feast of Trumpets, repeating the same formula as the new moon.
Numbers 15:24 also prescribes a male goat for a sin offering, but for unintentional sins of the congregation — different purpose.
Romans 8:3 explains that the law's sin offerings (like this goat) were weak — Christ condemned sin in the flesh.
Exodus 29:40 specifies the drink offering for the regular burnt offering that Numbers 28:15 references as 'its drink offering'.
Ezekiel 45:23 also includes a male goat for sin offering during festivals, showing continuity of this practice into the restored temple.
Leviticus 4:23 uses a male goat for a leader's individual sin offering — similar animal type but distinct occasion.
Leviticus 16:15 describes the Day of Atonement goat sin offering — a more elaborate ritual than the monthly offering here.