John Gill Commentary Deuteronomy 9:19

"For I was afraid of the anger and hot displeasure, wherewith Jehovah was wroth against you to destroy you. But Jehovah hearkened unto me that time also." — Deuteronomy 9:19 (ASV)

For I was afraid of the anger and hot displeasure with which
the Lord was wroth against you
Which was exceeding vehement, as appeared by his words to Moses, forbidding to intercede for them, that he might consume them, and make of him a greater nation; wherefore he dreaded the issue of it, lest it should be

to destroy you ;
that that should be his full resolution and determination; however, he made use of means, and betook himself to fasting and prayer; so heartily affected was he to this people when his temptations lay another way:

but the Lord listened to me at that time also ;
as he had at other times, when this people had sinned, and he entreated for them; in which he was a type of Christ, the Mediator and Advocate, whom the Father always hears.