عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ رَضِيَ اللَّهُ عَنْهُ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: أَيُّ الصَّلَاةِ أَفْضَلُ؟ قَالَ: ((طُولُ الْقُنُوتِ))
It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was asked: Which prayer is the most virtuous? He (peace and blessings be upon him) replied: Prolonged standing in prayer.