"Three shall be on dunes of musk" - it seems to me that he said:- "on the Day of Resurrection. The first and the last of peoples shall envy them: A man who calls to the five [prayers] every day and night; a man who leads a group of people and they are pleased with him, and a slave who fulfills the right of Allah and the right of his masters."
قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثَةٌ عَلَى كُثْبَانِ الْمِسْكِ أُرَاهُ قَالَ يَوْمَ الْقِيَامَةِ يَغْبِطُهُمُ الأَوَّلُونَ وَالآخِرُونَ رَجُلٌ يُنَادِي بِالصَّلَوَاتِ الْخَمْسِ فِي كُلِّ يَوْمٍ وَلَيْلَةٍ وَرَجُلٌ يَؤُمُّ قَوْمًا وَهُمْ بِهِ رَاضُونَ وَعَبْدٌ أَدَّى حَقَّ اللَّهِ وَحَقَّ مَوَالِيهِ