'House top' in the Bible

Whoever is on the housetop must not go down to get the things that are in his house [because there will not be enough time].

Whoever is on the housetop must not go down [to enter the house], or go inside to take anything out of his house;

On that day, whoever is on the housetop, with his belongings in the house, must not come down [and go inside] to take them out; and likewise whoever is in the field must not turn back.