Deuteronomy 9:18

18 Then once again I lay face downward in the Lord's presence for forty days and nights and did not eat or drink anything. I did this because you had sinned against the Lord and had made him angry.

Deuteronomy 9:18 Meaning and Commentary

Deuteronomy 9:18

And I fell down before the Lord
In prayer for Israel who had sinned; but this he did not immediately after he had broken the tables, but when he had first ground the calf to powder, strewed it on the water, and made the children of Israel drink it; and when he had chided Aaron, and ordered the sons of Levi to slay every man his brother:

as at the first forty days and forty mights;
which is to be connected, I think, not with what goes before; for we read not that he fell down before the Lord, at the first time he was with him so long in the mount; but with what follows: "I did neither eat bread nor drink water"; as he neither ate nor drank the first forty days, so neither did he these second forty; see ( Deuteronomy 9:9 )

because of all your sins which ye sinned, in doing wickedly in the
sight of the Lord, to provoke him to anger;
for they were guilty of more sins than one; besides idolatry, they were guilty of unbelief, ingratitude which were notorious and flagrant, were done openly and publicly, in sight of his glory and majesty on the mount; all which must be very provoking to him, and on account of these Moses prayed and fasted.

Deuteronomy 9:18 In-Context

16 I saw that you had already disobeyed the command that the Lord your God had given you, and that you had sinned against him by making yourselves a metal idol in the form of a bull-calf.
17 So there in front of you I threw the stone tablets down and broke them to pieces.
18 Then once again I lay face downward in the Lord's presence for forty days and nights and did not eat or drink anything. I did this because you had sinned against the Lord and had made him angry.
19 I was afraid of the Lord's fierce anger, because he was furious enough to destroy you; but once again the Lord listened to me.
20 The Lord was also angry enough with Aaron to kill him, so I prayed for Aaron at the same time.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.