A man must partake of fourteen meals in the booth during the Feast of Tabernacles.
Succah, fol. 27, col. 1.
Traditional chronology records that the Israelites killed the Paschal lamb on the fourteenth day of Nisan, the month on which they came out of Egypt. They came out on the fifteenth; that day was a Friday.
Shabbath, fol. 88, col. 1.