Commentary for Ezra 3:3

And they set the altar on its bases in order to offer up sacrifices upon it, because they were afraid of the peoples of the land, lest they taunt them and lest they slander them to the king. And they built the altar to offer up burnt offerings upon it, in order that the peoples hear and understand the matter, that they did it with the sanction of the king and therefore they would hesitate to taunt them about the building of the Temple.

for the morning and for the evening the daily sacrifice of the morning and the daily sacrifice of twilight.