Exodus 40:2

40:2 “On the first day of the first month you are to set up the tabernacle, the tent of meeting.

Exodus 40:17

40:17 So the tabernacle was set up on the first day of the first month, in the second year.

Exodus 4:8

4:8 “If they do not believe you or pay attention to the former sign, then they may believe the latter sign.

Exodus 12:15-16

12:15 For seven days you must eat bread made without yeast. Surely on the first day you must put away yeast from your houses because anyone who eats bread made with yeast from the first day to the seventh day will be cut off from Israel.

12:16 On the first day there will be a holy convocation, and on the seventh day there will be a holy convocation for you. You must do no work of any kind on them, only what every person will eat – that alone may be prepared for you.