'Season' in the Bible

Moreover let the children of Israel keep the passover in its appointed season.

In the fourteenth day of this month, at even, ye shall keep it in its appointed season: according to all the statutes of it, and according to all the ordinances thereof, shall ye keep it.

and those men said unto him, We are unclean by reason of the dead body of a man: wherefore are we kept back, that we may not offer the oblation of Jehovah in its appointed season among the children of Israel?

But the man that is clean, and is not on a journey, and forbeareth to keep the passover, that soul shall be cut off from his people; because he offered not the oblation of Jehovah in its appointed season, that man shall bear his sin.

Command the children of Israel, and say unto them, My oblation, my food for my offerings made by fire, of a sweet savor unto me, shall ye observe to offer unto me in their due season.