The day of the first fruits — In the feast of pentecost, Acts 2:1. Your weeks — The seven weeks which you are to number from the passover.
Related Commentaries of Numbers 28:26
Numbers 28:26
26 Also in the day of the firstfruits, when ye bring a new meat offering unto the LORD, after your weeks be out, ye shall have an holy convocation; ye shall do no servile work: