Exodus 6:23שמות ו׳:כ״ג
Aharon took Elisheva, daughter of Aminadav, sister of Nachshon, for a wife, and she bore him Nadav, Avihu, Elazar and Isamar.
Exodus 6:25שמות ו׳:כ״ה
Elazar, son of Aharon took, for himself one of the daughters of Putieil, for a wife, and she bore him Pinchas. These are the heads of the Levites’ patriarchs according to their families.
Exodus 24:1שמות כ״ד:א׳
He [God] had said to Moshe, ‘Go up to [the Presence of] Adonoy, you, Aharon, Nadav, Avihu, and seventy of the elders of [the B’nei] Yisrael, and prostrate yourselves at a distance.
Exodus 24:9שמות כ״ד:ט׳
Moshe and Aharon then went up along with Nadav and Avihu, and seventy of the elders of [the B’nei] Yisrael.
Exodus 28:1שמות כ״ח:א׳
And [now separate] and take unto you your brother, Aharon, and his sons with him, from among the B’nei Yisrael, to serve Me [as kohanim]: Aharon, Nadav, Avihu, Elazar, and Isamar, the sons of Aharon.
Exodus 38:21שמות ל״ח:כ״א
These are the accounts of the mishkon, the mishkon of Testimony, that were drawn up by Moshe’s order; for the work of the Levites under the direction of Isamar, son of Aharon the kohein.