'Whether' in the Bible

The Pharisees were watching Jesus closely to see if He would heal him on the Sabbath, so that they might accuse Him [in the Jewish high court].

Someone ran and filled a sponge with sour wine, put it on a reed and gave Him a drink, saying, “Let us see whether Elijah is coming to take Him down.”

Pilate wondered if He was dead by this time [only six hours after being crucified], and he summoned the centurion and asked him whether He was already dead.