17 – “The Messenger of Allah used to say, ‘O Allah, I seek refuge in You from a prayer that brings no benefit.’”
Reported by Abū Dāwūd and Ibn Ḥibbān on the authority of Anas.
Authentic: Ṣaḥīḥ Abī Dāwūd (1549), Maʿārif edition.
Later ruled weak: Ḍaʿīf Abī Dāwūd, “al-Kitāb al-Kabīr” (272/1), Gharas edition.

18 – Zaynab, the wife of ʿAbdullāh ibn Masʿūd, narrated that ʿAbdullāh saw a cord around my neck … “a cure that leaves no illness behind.”
Reported by Ibn Mājah.
Authentic in its entirety: Ghāyat al-Marām (299–298).
Later ruled weak: al-Silsilah al-Ṣaḥīḥah (under 2972).