Exodus 12:6 And you shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening. Torrey's Topical Textbook
Numbers 9:3 In the fourteenth day of this month, at even, you shall keep it in his appointed season: according to all the rites of it, and according to all the ceremonies thereof, shall you keep it. Torrey's Topical Textbook