John Calvin Commentary Genesis 19:15

"And when the morning arose, then the angels hastened Lot, saying, Arise, take thy wife, and thy two daughters that are here, lest thou be consumed in the iniquity of the city." — Genesis 19:15 (ASV)

The angels hastened Lot. Having praised the faith and piety of Lot, Moses shows that something human still clung to him, because the angels hastened him while he lingered. The cause of his slowness might have been that he thought he was going into exile; thus, many cares and fears disturbed his anxious mind.

For he doubts what will happen to him as a fugitive when, having left his house and furniture, destitute and in need, he must make his way to some desolate place. Meanwhile, he does not consider that he must act like shipwrecked people who, to arrive safely in port, throw their cargo and everything they have into the sea.

Indeed, he does not doubt that God is speaking the truth, nor does he refuse to move elsewhere as he is commanded. But, as if sinking under his own weakness and entangled by many cares, he, who should have run out hastily and without delay, moves at a slow and halting pace.

In his person, however, the Spirit of God presents to us, as in a mirror, our own slowness, so that we, shaking off all sloth, may learn to prepare ourselves for prompt obedience as soon as the heavenly voice sounds in our ears. Otherwise, in addition to the indolence that naturally dwells within us, Satan will interpose many delays.

The angels, to urge Lot forward more effectively, instill the fear that he might be destroyed in the iniquity, or the punishment, of the city. For the word עוון (ayon) signifies both. Not that the Lord rashly throws the innocent onto the same heap as the wicked; rather, the person who will not ensure his own safety—and who, even when warned to be careful, still exposes himself to ruin through his sloth—deserves to perish.