Genesis 5:13אַרְבָּעִים
And after he had become the father of Mahalalel, Kenan lived 840 years and had other sons and daughters.
Exodus 16:35אַרְבָּעִים
The Israelites ate manna forty years, until they came to a land where they could settle; they ate manna until they reached the border of Canaan.
Numbers 1:21וְאַרְבָּעִים
those registered to the tribe of Reuben numbered 46,500.
Deuteronomy 1:3בְּאַרְבָּעִים
In the fortieth year, on the first day of the eleventh month, Moses proclaimed to the Israelites all that the LORD had commanded him concerning them.
1 Kings 2:11אַרְבָּעִים
The length of David’s reign over Israel was forty years—seven years in Hebron and thirty-three years in Jerusalem.
Nehemiah 5:15אַרְבָּעִים
The governors before me had heavily burdened the people, taking from them bread and wine plus forty shekels of silver. Their servants also oppressed the people. But I did not do this, because of my fear of God.

Brown-Driver-Briggs

אַרְבָּעִים a forty

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.