In that day, he which shall be upon the housetop
 Either for diversion or devotion, when he shall hear that the Roman armies are approaching to Jerusalem, to besiege it: 
 and his stuff in the house;
 or "his vessels", his goods and furniture; or his utensils, and instruments of trade and business: 
 let him not come down;
 the inner way of the house, from the top: 
 to take it away;
 with him in his flight, but let him descend by the steps, or ladder, on the outside of the house, and make his escape directly to Pella, or the mountains: 
 and he that is in the field;
 at work, and has laid down his clothes in some certain part of the field, or at home: 
 let him likewise not return back;
 to fetch them, but make the best of his way as he is; (See Gill on Matthew 24:17) and (See Gill on Matthew 24:18).