Numbers 1:18

1:18 and they assembled the entire community together on the first day of the second month. Then the people recorded their ancestry by their clans and families, and the men who were twenty years old or older were listed by name individually,

Numbers 1:20

1:20 And they were as follows:

The descendants of Reuben, the firstborn son of Israel: According to the records of their clans and families, all the males twenty years old or older who could serve in the army were listed by name individually.

Numbers 1:22

1:22 From the descendants of Simeon: According to the records of their clans and families, all the males numbered of them twenty years old or older who could serve in the army were listed by name individually.

Numbers 7:87-88

7:87 All the animals for the burnt offering were 12 young bulls, 12 rams, 12 male lambs in their first year, with their grain offering, and 12 male goats for a purification offering. 7:88 All the animals for the sacrifice for the peace offering were 24 young bulls, 60 rams, 60 male goats, and 60 lambs in their first year. These were the dedication offerings for the altar after it was anointed.

Numbers 14:34

14:34 According to the number of the days you have investigated this land, forty days – one day for a year – you will suffer for your iniquities, forty years, and you will know what it means to thwart me.

Numbers 29:13

29:13 You must offer a burnt offering, an offering made by fire as a pleasing aroma to the Lord: thirteen young bulls, two rams, and fourteen lambs each one year old, all of them without blemish.

Numbers 32:11

32:11 ‘Because they have not followed me wholeheartedly, not one of the men twenty years old and upward who came from Egypt will see the land that I swore to give to Abraham, Isaac, and Jacob,