"The two feet of the Son of Adam will not move from near his Lord on the Day of Judgement until he is asked about five (matters): about his life - how he spent it; about his youth - how he took care of it; about his wealth - how he earned it and where he spent it; and about that which he acted upon from the knowledge he acquired"
(al-Tirmidhi) [src: p9, The Broken Chain (Ltd Edition), Aftab Ahmad Malik]
The Holy Messenger of Allah the Almighty صلي الله عليه و سلم is quoted on the authority of Abu Huraira رضی الله تعلٰی عنه to have said:
“Allah the Almighty says, ‘I am towards My servant as he is towards Me. I am with him when he remembers Me (dhikr). If he remembers Me within himself, I remember him within Myself. If he remembers Me in a gathering, I remember him in a gathering better than it.’”
(Sahih Al-Bhukhari V2, P1101) [src] p5, 4 Natijatu Al-Fikr Fi Al-Jahri Fi Al-Dhikr (Outcome of Contemplation over Vociferous Dhikr) an extract from Al-Hawi Lil Fatawa by Jalal Al-Din Al-Suyuti رحمتاالله علیه, Dar-ul-Ehsan Publications
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