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:73:14 –

On the Day the earth and the mountains will convulse and the mountains will become a heap of sand pouring down.  

on the day when the earth and the mountains will quake and the mountains will be like heaps of shifting sand (mahīl derives from hāla, yahīlu; it is actually mahyūl, but the damma sound is considered too heavy for the yā’ and is therefore transposed onto the hā’, while the wāw, the second of two unvocalised consonants, is omitted on account of it being extra, and the damma is replaced by a kasra because of its ˹phonetic˺ affinity the ˹letter˺ yā’).
القرآن:٧٣:١٤ –

يَوْمَ تَرْجُفُ الْأَرْضُ وَالْجِبَالُ وَكَانَتِ الْجِبَالُ كَثِيبًا مَهِيلًا  

{يوم ترجف} تزلزل {الأرض والجبال وكانت الجبال كثيبا} رملا مجتمعا {مهيلا} سائلا بعد اجتماعه وهو من هال يهيل وأصله مهيول استثقلت الضمة على الياء فنقلت إلى هاء وحذفت الواو ثاني الساكنين لزيادتها وقلبت الضمة كسرة لمجانسة الياء.