Didascalia Apostolorum In
Chapter XXI Look for [ver. 13] and
[ver. 17]
Here is the section of the Didascalia. For this to be true, there has to be something in that
Exodus quote that the Temple authorities could use as a pretext to celebrate the Passover early. The text is saying it wasn't correct ('erring utterly').
"But by reason of the multitudes of all the people, from every city and from all the villages, who were coming up to the temple to keep the Passover in Jerusalem,
the priests and elders took counsel and commanded and appointed that they should keep the festival straightway, that
they might seize Him without disturbance. For the inhabitants of Jerusalem were engaged with the sacrifice and the eating of the Passover; and moreover, all the people that were without were not yet come,
for they had deceived them as to the days.
That they might be convicted before God of erring utterly in all things, therefore they anticipated the Passover by three days, and
kept it on the eleventh of the moon, on the third day of the week. For they said: 'Because the whole people is gone astray after Him, now that we have an occasion let us seize Him; and then, when all the people are come, let us put Him to death before all, that this may be known openly, and all the people may turn back from after Him.'
And so in the night when the fourth day of the week drew on, (Judas) betrayed our Lord to them. But they made the payment to Judas on the tenth of the month, on the second day of the week; wherefore they were accounted by God as though on the second day of the week they had seized Him, [[189]] because on the second of the week they had taken counsel to seize Him and put Him to death; and they accomplished their malice on the Friday: as Moses had said concerning the Passover, thus:
It shall be kept by you (p. 93) from the tenth until the fourteenth: and then all Israel shall sacrifice the passover [Ex 12.6]."
The "(p.93)" must refer to a book form of this document. I didn't see anything in this at page 93:
So the Temple Authorities moved up Passover to avoid 'disturbance'.