Him which is on the house-top - The roofs of the houses in Eastern countries were made flat, so that they were favorable places for walking and retirement. See the notes at Matthew 9:1-8. The meaning here is, that He who should be on the house-top when this calamity came upon the city “should flee without delay;” He should not even take time to secure any article of apparel from his house. So sudden would be the calamity, that by attempting to do this He would endanger his life.
Related Commentaries of Matthew 24:17
Matthew 24:17
17 Let him which is on the housetop not come down to take any thing out of his house: