Exodus 30:10-12

Young's Literal Translation

¹⁰ and Aaron hath made atonement on its horns, once in a year, by the blood of the sin-offering of atonements; once in a year doth he make atonement for it, to your generations; it [is] most holy to Jehovah.'

¹¹ And Jehovah speaketh unto Moses, saying,

¹² `When thou takest up the sum of the sons of Israel for their numbers, then they have given each an atonement [for] his soul to Jehovah in their being numbered, and there is no plague among them in their being numbered.