See Leviticus 4:3. Aaron’s sons here spoken of (as in Leviticus 6:22) must be the succession of high priests who succeeded him. The day of this offering was probably the eighth day of the ceremony of consecration Leviticus 8:35; Leviticus 9:1, when the high priest appears to have entered upon the duties of his office.
A meat offering perpetual - Jewish tradition is in favor of these words implying that this מנחה mı̂nchāh was offered by the high priest as a daily rite from the time of his consecration.