Hadith 16
من أحدث ولم يتوضأ فقد جفاني ومن توضأ ولم يصل فقد جفاني ومن صلى ولم يدعني فقد جفاني ومن دعاني فلم أجبه فقد جفيته ولست برب جاف
"Whoever lost his ablution and did not perform ablution has certainly wronged Me; whoever performed ablution and did not pray has certainly wronged Me; whoever prayed and did not supplicate to Me has certainly wronged Me; and whoever supplicated to Me but I did not accept his supplication, then certainly I have wronged him, and I am not an unjust Lord."