Acts 3:1 - Joseph Benson’s Commentary on the Old and New Testaments

Now Peter and John, &c. We are not informed when the fact here recorded took place; but it is probable it was during the days of the feast of pentecost, and while the city was still full of people; went up to the temple Probably to seek an opportunity of preaching to the people, as well as to offer up their prayers and supplications there before God; at the ninth hour One of the solemn hours of prayer. The Jews divided the time, from sunrise to sunset, into twelve hours; which were consequently of unequal length at different times of the year, as the days were longer or shorter. The third hour, therefore, was nine in the morning; the ninth three in the afternoon, but not exactly. For the third was the middle space between sunrise and noon; which, if the sun rose at five, (the earliest hour of its rising in that climate,) was half an hour after eight; if at seven, (the latest hour of its rising there,) was half an hour after nine. The chief hours of prayer were the third and ninth; at which seasons the morning and evening sacrifices were offered, and incense (a kind of emblem representing prayer) burnt on the golden altar.