How they prayed: Abu Al-Aliyah sayings
From the lives of our pious predecessors:
Abu Al-Aliyah said, "I would travel for days to meet a man and the first thing I would notice about him is his prayer. If he would establish the prayer perfectly and on time, I would stay with him and hear the knowledge he had. If I found him to be careless concerning the prayer, I would leave him and say to myself that for things other than the prayer, he would be even more careless."
(Hilyat Al-Awliya, 2/312)