וַיְהִי֩ כְהוֹצִיאָ֨ם אֹתָ֜ם הַח֗וּצָה וַיֹּ֙אמֶר֙ הִמָּלֵ֣ט עַל־נַפְשֶׁ֔ךָ אַל־תַּבִּ֣יט אַחֲרֶ֔יךָ וְאַֽל־תַּעֲמֹ֖ד בְּכָל־הַכִּכָּ֑ר הָהָ֥רָה הִמָּלֵ֖ט פֶּן־תִּסָּפֶֽה׃
And it came to pass, when they had brought them forth abroad, that he said: ‘Escape for thy life; look not behind thee, neither stay thou in all the Plain; escape to the mountain, lest thou be swept away.’
Read kabbalistic (mystical) interpretation of Genesis 19:17: and classical mystical sources.