Having mentioned Olivet as the place of the Lord's Ascension, he remarks on its position in relation to Jerusalem. He says that it is near Jerusalem, only a Sabbath day's journey away.
Rabbinic strictness concerning rest on the Sabbath day extended to extreme details, as we see also from the Gospels. It did not permit long journeys on the Sabbath day, lest the Sabbath rest be violated.
It was permitted to walk no more than two thousand steps on the Sabbath, that is, about one verst. Such a distance was called a Sabbath journey, or the way of the Sabbath.
The determination of precisely this distance was supposedly based on the fact that this was the distance from the outermost tents of the Hebrew camp to the tabernacle during the Hebrews' wandering in the wilderness under Moses.
Flavius gives the distance of Olivet from Jerusalem sometimes as six stadia, a little more than a verst, and sometimes as five stadia, a little less than a verst.
A Sabbath journey is somewhat longer than either distance indicated by Flavius. This, of course, depends on the point on the mountain from which the measurement is taken.
Perhaps the writer of Acts measures from that summit of the mountain from which the Lord's Ascension took place. For that reason the distance came out longer than according to Flavius's reckoning.
In Luke's Gospel (Lk. 24:50) it is said that the Lord led His disciples out of Jerusalem as far as Bethany and ascended.
This does not contradict the indication in Acts that Olivet, or one of the summits of Olivet, was the place of the Lord's Ascension.
For the Gospel does not say that the Ascension occurred precisely near Bethany. It means only that the place of the Ascension was on the road from Jerusalem to Bethany.
The passage in Acts under consideration more precisely determines the location of the event of the Ascension: on the Mount of Olives, on one of its summits.
Bethany was fifteen stadia from Jerusalem (Jn. 11:18), that is, about two and a half versts. A Sabbath journey was about one verst.
Therefore the Ascension took place from a place lying almost halfway from Jerusalem to Bethany.