335. hadíth
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «اَلشَّيْبُ فِي مُقَدَّمِ اَلرَّأْسِ يُمْنٌ وَ فِي اَلْعَارِضَيْنِ سَخَاءٌ وَ فِي اَلذَّوَائِبِ شَجَاعَةٌ وَ فِي اَلْقَفَا شُؤْمٌ.
The Messenger of Allah (saws) said: "Gray hair at the front of the head is a sign of blessing, at the temples is a sign of generosity, at the hair ends is a sign of courage, and at the nape of the neck is a sign of ill-omen."