Reference: al-Jaami’ lil-Khateeb – Volume 2, Page 258
Tahtheeb al-Kamaal – Volume 30, Page 480
al-Hifth – Ahammiyyatuhu, ‘Ajaa.ibuhu, Tareeqatuhu, Asbaabuhu – Page 67
‘Alaa ibn Khushrum said:
I have never seen Wakee’ with a book in his hands, rather, he memorised. So I asked him about the remedy for memorising and he said:
‘If I taught you the remedy would you use it?’ I said: ‘Yes, wAllaahi!’ He said: ‘Abandon sinning [since] I have never experienced anything like it for memorising.’