The Letter Qaf 50:8. Juz 26, page 518.
تَبْصِرَةً وَذِكْرَىٰ لِكُلِّ عَبْدٍ مُّنِيبٍ٨
A vision and a reminder for every penitent slave.
Qaf 50:8, translated by Marmaduke Pickthall