en_tn/act/07/30.md

When forty years were past

"After 40 years passed." This was the amount of time Moses had been in Midian. AT: "Forty years after Moses fled from Egypt" (See: rc://en/ta/man/translate/figs-explicit)

an angel appeared

Stephen's audience knew that God spoke through the angel. The UDB makes this explicit. (See: rc://en/ta/man/translate/figs-explicit)