John Gill

Haste thee, escape thither,.... Seeing he had granted him his request, he is urgent upon him to be gone, and not to delay upon any account, or make other excuses: for I cannot do anything till thou be come thither; that is, consistent with the decree of God, that Lot and his family should be delivered and preserved, and with his promise made to him, that he would not overthrow that city; and therefore the catastrophe which would befall all the cities at once could not begin until he was safely arrived there: therefore the name of the city was called Zoar; in later times, and probably first by Lot, from his use of the word "little", which was his request, which Zoar signifies; it before was called Bela, see Gen 14:2.