7:131 When good things came their way, they said, 'It is our due,' but when evil befell them they blamed their ill fortune on Moses and those with him. Indeed their ill fortune was with Allah, though most of them did not know.
7:133 So We sent upon them floods, locusts, lice, frogs, and blood. (All these were) clear signs, yet they were proud against them, for they were wicked people.
7:134 And when the plague smote them, they said, 'Moses, pray to your Lord for us invoking the promise He has made with you. If you lift the plague from us, we will believe in you and let the Children of Israel go with you.'