Numbers 10:10-11

¹⁰'And in the day of your gladness, and in your appointed seasons, and in the beginnings of your months, ye have blown also with the trumpets over your burnt-offerings, and over the sacrifices of your peace-offerings, and they have been to you for a memorial before your God; I, Jehovah, am your God.'

¹¹And it cometh to pass — in the second year, in the second month, in the twentieth of the month — the cloud hath gone up from off the tabernacle of the testimony,