(Recall) when their brother Lot said to them (by way of timely warning): "Will you not keep from disobedience to God in reverence for Him and seek refuge with His protection
When their brother Lot asked them, “Do you not fear and beware?”
Al-muntakhab fi tafsir al-Qur'an al-Karim
Their brother Lut tried hard to induce them to open their hearts' ears and their minds' eyes and listen to exhortation. Entertaining expectation of something desired, he -Lut- said to them: "Will you not keep in awe of Allah and entertain the profound reverence dutiful to Him!"