رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 792
The Book of Dress
The Description of the Length of the Qamees' Sleeves, the End of the Turban, and Prohibition of Wearing Long Garments Out of Pride and Undesirability of Wearing Them Without Pride
وَعَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: مَا أَسْفَلَ مِنَ الْكَعْبَيْنِ مِنَ الإِزَارِ فَفِي النَّارِ .((رَوَاهُ البخارى))
Abu Hurairah (May Allah be pleased with him) reported: The Prophet (ﷺ) said, "What is below the ankles of a lower garment is condemned to the Fire (Hell)." [Al-Bukhari].
Riyad as-Salihin, 792