Now on the last and most important day of the feast, Jesus stood and called out [in a loud voice], “If anyone is thirsty, let him come to Me and drink!

Since it was the day of Preparation [for the Sabbath], in order to prevent the bodies from hanging on the cross on the Sabbath (for that Sabbath was a high holy day) the Jews asked Pilate to have their legs broken [to hasten death] and the bodies taken away.