Ten miracles were wrought for our forefathers in Egypt, and ten at the
Red Sea. Ten plagues did the Holy One--blessed be He!--inflict on the
Egyptians in Egypt, and ten at the sea. Ten times did our ancestors
tempt God in the wilderness, as it is said (Num. xiv. 22), "And have
tempted me now these ten times, and have not hearkened to my voice."
THE TALMUD, _Avoth_, mish. 5, 6, 7.