29 This will be a permanent regulation for you all:

On the 10th of the seventh month (of Tishrei—around September/October), all of you including those who are native-born as well as foreigners living among you, must humble yourselves and not work that day[ref] 30 because on that day, the high priest will purify you all from your sins to make you right with Yahweh, and you’ll be ‘clean’. 31 It’ll be a very sacred rest day for you, and you all must humble yourselves—a permanent regulation for you all. 32 The priest who’s anointed and ordained to succeed his father as high priest must be the one to make atonement, and he must be wearing his sacred linen clothes. 33 He will first purify the sacred room and the sacred tent, and the altar, and then make all the priests right with Yahweh and finally, the entire community. 34 That will become a permanent regulation every year to make all the Israelis right with Yahweh because of their sins.

So Mosheh did exactly as Yahweh had instructed him.