Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:18:90 –

Until, when he came to the rising of the sun, he found it rising on a people for whom We had not made against it any shield.  

until, when he reached the rising of the sun, the place where it rises, he found it rising on a folk, namely, Negroes (zanj), for whom We had not provided against it, that is, ˹against˺ the sun, any ˹form of˺ cover, in the way of clothing or roofing, as their land could not support any structures; they had underground tunnels into which they would disappear at the rising of the sun and out of which they would emerge when it was at its highest point ˹in the sky˺.
القرآن:١٨:٩٠ –

حَتَّىٰ إِذَا بَلَغَ مَطْلِعَ الشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَمْ نَجْعَلْ لَهُمْ مِنْ دُونِهَا سِتْرًا  

{حتى إذا بلغ مطلع الشمس} موضع طلوعها {وجدها تطلع على قوم} هم الزنج {لم نجعل لهم من دونها} أي الشمس {سترا} من لباس ولا سقف، لأن أرضهم لا تحمل بناء ولهم سروب يغيبون فيها عند طلوع الشمس ويظهرون عند ارتفاعها.