Numbers 9:13 (BSB)

But if a man who is ceremonially clean and is not on a journey still fails to observe the Passover, he must be cut off from his people, because he did not present the LORD’s offering at its appointed time. That man will bear the consequences of his sin.

From Numbers 9. Also in the ESV.

Commentary on Numbers 9:13

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 9:1-14: Here we have, I. An order given for the solemnization of the passover, the day twelvemonth after they came out of Egypt, on the fourteenth day of the first month of the second year, some days before they were numbered, for that was done in the beginning of the second month. Observe, 1.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 9:13: And if a stranger shall sojourn among you, and will keep the passover unto the Lord,.... Then he must become a proselyte of righteousness, and be circumcised, or otherwise be might not eat of the passover, Exo 12:48; Ben Gersom interprets this of the second passover, and of a proselyte that was not obliged to the first, he not being then a proselyte, but became...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 9:6-14: A SECOND PASSOVER ALLOWED. (Num 9:6-14) there were certain men, who were defiled by the dead body of a man--To discharge the last offices to the remains of deceased relatives was imperative; and yet attendance on a funeral entailed ceremonial defilement, which led to exclusion from all society and from the camp for seven days.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 9:13: But the man that [is] clean, and is not in a journey, and forbeareth to keep the passover, even the same soul shall be cut off from among his people: because he brought not the offering of the LORD in his appointed season, that man shall bear his sin. (f) When the Passover is celebrated.