In Jesus' warning, who is the person on the housetop told not to go down to get anything out of his house?
A retired, well-to-do individual who is no longer working is the one addressed. He likely has many possessions in his house he would like to keep, such as antiques or fine furniture, but he is told not to go down to retrieve anything.
Les explains that in Jesus' warning to those in Judea to flee to the mountains, the person on the housetop is no doubt a retired individual who has become quite well-to-do. He is no longer working and probably has many things in his house he would like to hang on to—maybe antiques or beautiful furniture. But because time is of the essence, he will not have time or opportunity to take any of those things with him; he is told to move out. Les notes this instruction is repeated in verse 17. The context is the midpoint of the Tribulation, when Jews in the environs of Jerusalem are to escape. This is not the 144,000 but a cross section of society—men, women, young women, and children. It parallels Israel's escape out of Egypt, and just as God protected and provided for the Jews in the wilderness, He will protect and provide for these escaping Jews. The next example is the working class, specifically agricultural workers in the field, who are not to return for their clothes but take what they have on their backs and get out of Jerusalem.
Let him which is on the housetop not come down to take any thing out of his house: