Deuteronomy 9:20

20 And he was angry with Aaron to destroy him utterly, and I prayed for Aaron also at that time.

Deuteronomy 9:20 Meaning and Commentary

Deuteronomy 9:20

And the Lord was very angry with Aaron, to have destroyed him,
&c.] For complying with the request of the people in making a calf for them, and for that miserable shift he made to excuse himself; which so provoked the Lord, that he threatened to destroy him, and he was in danger of being cut off, had it not been for the intercession of Moses:

and I prayed for Aaron also the same time:
who either was included in the general prayer for the people, ( Exodus 32:31 ) or a particular prayer was made for him, though not recorded, and which also succeeded.

Deuteronomy 9:20 In-Context

18 And I made my petition before the Lord as also at the first forty days and forty nights: I ate no bread and drank no water, on account of all your sins which ye sinned in doing evil before the Lord God to provoke him.
19 And I was greatly terrified because of the wrath and anger, because the Lord was provoked with you utterly to destroy you; yet the Lord hearkened to me at this time also.
20 And he was angry with Aaron to destroy him utterly, and I prayed for Aaron also at that time.
21 And your sin which ye had made, the calf, I took, and burnt it with fire, and pounded it and ground it down till it became fine; and it became like dust, and I cast the dust into the brook that descended from the mountain.
22 Also in the burning, and in the temptation, and at the graves of lust, ye provoked the Lord.

The Brenton translation of the Septuagint is in the public domain.