Midrasch zu Jechezkiel 46:3

Rabbi Jehudah said: On Sabbath and New Moons Israel stood there, (and they perceived) that the Sabbath day had come, and they sanctified the Sabbath day; and so also on the New Moons the Israelites were standing there and saw the doors opening by themselves, and they knew that in that hour it was New Moon, and they sanctified the New Moon, and afterwards (this was done) among the heavenly ones. Therefore Israel sanctifies the New Moons first in the lower regions (on earth) and afterwards (it is sanctified) in the heavenly regions, because they have defined the beginning of the Molad of the Moon in the presence of Israel, who saw the doors open by themselves, and they knew that the Shekhinah of the Holy One, blessed be He (was therein), as it is said, "For the Lord, the God of Israel, hath entered in by it" (Ezek. 44:2). Forthwith they fall down and prostrate themselves before their God. So it was in the past and so will it be in the future that is to come, as it is said, "And the people of the || land shall worship at the door of that gate before the Lord in the Sabbaths and in the New Moons" (Ezek. 46:3).