Numbers 9:14 (BSB)

If a foreigner dwelling among you wants to observe the Passover to the LORD, he is to do so according to the Passover statute and its ordinances. You are to apply the same statute to both the foreigner and the native of the land.’”

From Numbers 9. Also in the ESV.

Commentary on Numbers 9:14

• 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 9:14: And on the day that the tabernacle was reared up,.... Which was the first day of the first month in the second year of the people of Israel's coming out of Egypt, Exo 40:1, the cloud covered the tabernacle, namely, the tent of the testimony; that part of the tabernacle in which the testimony was, that is, where the ark was, in which the law...
• 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.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 9:14: if a stranger shall sojourn among you, and will keep the passover--Gentile converts, or proselytes, as they were afterwards called, were admitted, if circumcised, to the same privileges as native Israelites, and were liable to excommunication if they neglected the passover. But circumcision was an indispensable condition; and whoever did not submit to that rite, was prohibited, under the sternest penalties, from eating the passover.