Strong's H705: אַרְבָּעִים (ʼarbâʻîym) Definition

Numbers 33:38 - went up And Aaron the priest Hor into mount at the commandment of the LORD and died year there in the fortieth were come out after the children of Israel of the land of Egypt month day of the fifth in the first month

Numbers 35:6 - And among the cities thither and to them ye shall add unto the Levites there shall be six And among the cities for refuge thither and to them ye shall add that he may flee for the manslayer thither and to them ye shall add forty and two And among the cities

Numbers 35:7 - So all the cities which ye shall give to the Levites shall be forty and eight So all the cities them shall ye give with their suburbs

Psalms 95:10 - Forty years long was I grieved with this generation and said It is a people that do err in their heart and they have not known my ways