Pirkei Avot §avot_05_04: Ten miracles were wrought for our ancestors in Egypt, and ten at the sea.

Ten miracles were wrought for our ancestors in Egypt, and ten at the sea. Ten plagues did the Holy one, blessed be He, bring upon the Egyptians in Egypt and ten at the sea. [With] ten trials did our ancestors try God, blessed be He, in the Wilderness, as it is said, “and they have tried Me these ten times and they have not listened to my voice” (Numbers 14:22).