Where in the Old Testament are the seven feasts of Jehovah given to Israel?

Les teaches that if you go back to the Old Testament, Leviticus chapter 23 contains the seven feasts of Jehovah as they were given to the nation of Israel at Sinai. When they were given the tabernacle and priesthood, God also gave instructions for their seven feast days. It began with Passover, the feast day Israel was celebrating at the time of the crucifixion; since Passover was about to begin at 6 o'clock Friday evening, they had to hurry to get the body down off the cross. Paul later shows in Corinthians that Christ became our Passover lamb. Les points out that these seven feasts all have an indication of a New Testament truth. He then moves to Leviticus 23:9 to discuss firstfruits, noting that in Israel's ancient history they were primarily agricultural or agrarian, so the Bible and Christ's earthly ministry use ordinary farming language. In Leviticus 23:9, the Lord spoke unto Moses, telling the children of Israel that when they came into the land and reaped its harvest, they were to bring a sheaf of the firstfruits unto the priest.