New Revised Standard Version
and said to him, “Although we are unclean through touching a corpse, why must we be kept from presenting the LORD’s offering at its appointed time among the Israelites?”

Contemporary English Version
"Even though we have touched a dead body, why can't we celebrate Passover and offer sacrifices to the LORD at the same time as everyone else?"

New American Bible
and they said to them, “Although we are unclean because of a human corpse, why should we be deprived of presenting the LORD’s offering at its prescribed time along with other Israelites?”

Douay-Rheims Bible
Said to them: We are unclean by occasion of the soul of a man. Why are we kept back that we may not offer in its season the offering to the Lord among the children of Israel?

Said to them: We are unclean by occasion of the soul of a man. Why are we kept back that we may not offer in its season the offering to the Lord among the children of Israel?

we may not offer

Numbers 9:2 Let the children of Israel make the phase in its due time,

Exodus 12:27 You shall say to them: It is the victim of the passage of the Lord, when he passed over the houses of the children of Israel in Egypt, striking the Egyptians, and saving our houses. And the people bowing themselves, adored.

Deuteronomy 16:2 And thou shalt sacrifice the phase to the Lord thy God, of sheep, and of oxen, in the place which the Lord thy God shall choose, that his name may dwell there.

2 Chronicles 30:17-19 Because a great number was not sanctified: and therefore the Levites immolated the phase for them that came not in time to be sanctified to the Lord. . . .

1 Corinthians 5:7,8 Purge out the old leaven, that you may be a new paste, as you are unleavened. For Christ our pasch is sacrificed. . . .