Numbers 28:18

18 in the first day [is] an holy convocation, ye do no servile work,

Numbers 28:18 In-Context

16 `And in the first month, in the fourteenth day of the month, [is] the passover to Jehovah;
17 and in the fifteenth day of this month [is] a festival, seven days unleavened food is eaten;
18 in the first day [is] an holy convocation, ye do no servile work,
19 and ye have brought near a fire-offering, a burnt-offering to Jehovah: two bullocks, sons of the herd, and one ram, and seven lambs, sons of a year, perfect ones they are for you;
20 and their present, flour mixed with oil, three-tenth deals for a bullock, and two-tenth deals for a ram ye do prepare;
Young's Literal Translation is in the public domain.