Numbers 28:18 (BSB)

On the first day there is to be a sacred assembly; you must not do any regular work.

From Numbers 28. Also in the ESV.

Commentary on Numbers 28:18

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 28:16-31: Here is, I. The appointment of the pass-over sacrifices; not that which was the chief, the paschal lamb (sufficient instructions had formerly been given concerning that), but those which were to be offered upon the seven days of unleavened bread, which followed it, Num 28:17-25.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 28:18: In the first day shall be an holy convocation,.... The first of the seven days, which was kept in a very religious manner: ye shall do no manner of servile work therein; except by preparing food to eat; see Exo 12:16.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 28:18: In the first day [shall be] an holy convocation; ye shall do no manner of servile work [therein]: (f) Or, solemn assembly.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 28:16-22: Num 28:16-22 The same number of sacrifices as at the new moon were to be offered on every one of the seven days of the feast of unleavened bread (Mazzoth), from the 15th to the 21st of the month, whereas there was no general festal offering on the day of the Passover, or the 14th of the month (Exo 12:3-14).