Deuteronomy 9:11

9:11 Now at the end of the forty days and nights the Lord presented me with the two stone tablets, the tablets of the covenant.

Deuteronomy 9:25

Moses’ Plea on Behalf of the Lord’s Reputation

9:25 I lay flat on the ground before the Lord for forty days and nights, for he had said he would destroy you.

Deuteronomy 25:3

25:3 The judge may sentence him to forty blows, but no more. If he is struck with more than these, you might view your fellow Israelite with contempt.

Deuteronomy 29:5

29:5 I have led you through the desert for forty years. Your clothing has not worn out nor have your sandals deteriorated.