And it came to pass on the morrow
The above Targum paraphrases it,
``on the day after the day of atonement:''and so Jarchi observes the same, out of a book of theirs called Siphri; but rather this was either the day after the entertainment of Jethro with Aaron and the elders in the tent of Moses, or the day after Jethro's coming, as Aben Ezra:
that Moses sat to judge the people;
though his father-in-law was come to visit him, yet he did not neglect the care of his people, and the business that lay upon his hands for their good, civil and religious; but, the very day following his coming, closely applied himself to hear and judge causes; and such a vast body of people must find him work enough; and especially if we consider their quarrelsome disposition, for if they were so to one another, as they were to Moses and Aaron, they must be very litigious; however Moses bore with them, and attended to their causes, to do justice and judgment among them, being now made a prince and a judge over them by divine authority, and whom they acknowledged as such:
and the people stood by Moses, from the morning unto the evening;
not that a single cause was so long a trying, but there being so many of them in one day, that they lasted from the morning tonight; so that when one cause was dispatched and the parties dismissed, another succeeded, and so continued all the day long: Moses he sat as judge, with great majesty, gravity, and sedateness, hearkening with all attention to what was said on both sides, and the people they "stood", both plaintiff and defendant, as became them.
The Brenton translation of the Septuagint is in the public domain.