Exodus 18:25 New King James Version (NKJV)

²⁵ And Moses chose able men out of all Israel, and made them heads over the people: rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.

Exodus 24:1 New King James Version (NKJV)

Israel Affirms the Covenant

24 Now He said to Moses, “Come up to the Lord, you and Aaron, Nadab and Abihu, and seventy of the elders of Israel, and worship from afar.

Exodus 24:9 New King James Version (NKJV)

On the Mountain with God

⁹ Then Moses went up, also Aaron, Nadab, and Abihu, and seventy of the elders of Israel,