Deuteronomy 9:9

9:9 When I went up the mountain to receive the stone tablets, the tablets of the covenant that the Lord made with you, I remained there ¹  forty days and nights, eating and drinking nothing.

Deuteronomy 9:18

9:18 Then I again fell down before the Lord for forty days and nights; I ate and drank nothing because of all the sin you had committed, doing such evil before the Lord as to enrage him.

Deuteronomy 10:10

10:10 As for me, I stayed at the mountain as I did the first time, forty days and nights. The Lord listened to me that time as well and decided not to destroy you.

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¹ tn Heb “in the mountain.” The demonstrative pronoun has been used in the translation for stylistic reasons.