﴿ وَأَدْخَلْنَٰهُمْ فِى رَحْمَتِنَآ ۖ إِنَّهُم مِّنَ ٱلصَّٰلِحِينَ ﴾

“and so We admitted them unto Our grace: behold, they were among the righteous!”

And We admitted them into Our mercy through granting them prophethood. Indeed they were among the worthy of it. Dhū’l-Kifl was so called because he undertook takaffala to fast every day and stay up every night in prayer and to pass judgement between people without succumbing to anger and fulfilled this undertaking. It is also said however that he was not a prophet.