John Gill Commentary Exodus 23:14

"Three times thou shalt keep a feast unto me in the year." — Exodus 23:14 (ASV)

Three times you shall keep a feast unto me in the year .
] The feast of the passover, on the fourteenth of the month Nisan or March; and the feast of weeks or pentecost fifty days after that; and the feast of tabernacles on the fifteenth day of Tisri or September.