hadith
4558
۞
Imam Ali (AS) said, Night vigil is the insignia of the pious and the quality of those who yearn.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : سَهَرُ اللَّيْلِ شِعارُ المُتَّقينَ وَ شيمَةُ الْمُشتاقينَ