'Forty' in the Bible

When he mentioned the ark of God, Eli fell off the seat backwards by the side of the [city] gate. His neck was broken and he died, for he was old and heavy. He had judged Israel for forty years.

Saul was thirty years old when he began to reign, and he reigned forty-two years over Israel.

The Philistine [Goliath] came out morning and evening, and took his stand for forty days.