Exodus 23:14-17

Thomson(i) 14 Three times a year you shall keep a festival to me; 15 the festival of unleavened bread you shall carefully observe. Seven days you shall eat unleavened bread, as I have commanded you, at the time fixed in the month of new things. For in that month thou didst come out of Egypt. Thou shalt not appear before me empty. 16 Thou shalt also keep the festival of the ingathering of the first fruits of thy labours employed in sowing thy field; and the festival of completion at the end of the year, when thou hast gathered in thy labours from the field. 17 Three times a year all thy males must appear before the Lord thy God;
Reformed Dating