Another interpretation: “This month shall be for you” – the ministering angels said before the Holy One blessed be He: ‘Master of the universe, when are You going to set the festivals, as it is written: “The matter came about by the decree of the messengers, [the question by the word of the holy ones]?”’ (Daniel 4:14).7“The messengers” and “the holy ones” are the angels. He said to them: ‘I and you will ratify what Israel decides and [how they] intercalate the year, as it is stated: “I call to God Most High, to God who completes for me” (Psalms 57:3), and so it says: “These are the festivals of the Lord [that you shall proclaim them] holy convocations…”’ (Leviticus 23:37).
You [shall proclaim them], whether at the proper time or not at the proper time; I have no festivals other than these. The Holy One blessed be He said to Israel: ‘In the past, it was in My hands, as it is stated: “He made the moon for the festivals…” (Psalms 104:19),8The Jewish calendar is lunar, and the beginning of the months is determined by the new moon. but from here onward, it is given into your hands and is your prerogative; if you say yes, yes, if you say no, no.
In any case, “this month shall be for you.” Moreover, if you seek to intercalate the year I will confirm it for you.’ That is why it is written: “This month shall be for you.”