Matthew 24:17-21

17Let no one on the housetop go down to take anything out of the house. 18Let no one in the field go back to get their cloak. 19How dreadful it will be in those days for pregnant women and nursing mothers! 20Pray that your flight will not take place in winter or on the Sabbath. 21For then there will be great distress, unequaled from the beginning of the world until now—and never to be equaled again.