his grandfather, who said: al-Walīd ibn al-Walīd used to be frightened in his sleep, so he mentioned that to the Prophet (ṣallá Allāhu ʿalayhi wa-sallam), and he mentioned the ḥadīth. This is what he said! The ḥadīth is with Abū Dāwūd in "Kitāb al-Ṭibb" (3893) from the mentioned source with the wording: "that the Messenger of Allāh (ṣallá Allāhu ʿalayhi wa-sallam) used to teach them words for fear..." and he mentioned them, without any mention of al-Walīd ibn al-Walīd. It is also recorded by al-Tirmidhī (3519) who graded it as good, and al-Nasāʾī in "ʿAmal al-Yawm wa-al-Laylah" (no. 765), and al-Ḥākim (1/548) and al-Bayhaqī (p. 185-186), and "al-Ādāb" (993) by him and Ibn al-Sunnī (744) and Aḥmad (2/181) and Ibn Abī Shaybah (10/364) all from Ibn Isḥāq with a connected isnād. Yes, al-Bukhārī referenced it in "Afʿāl al-ʿIbād" (p. 88 - Hindiyyah) from his teacher Aḥmad ibn Khālid - who is al-Kindī Abū Saʿīd -: Muḥammad ibn Isḥāq narrated to us from it, with the wording: "al-Walīd ibn al-Walīd was a man who was frightened in his sleep..." and so on. This is a narration for al-Nasāʾī and Ibn ʿAbd al-Barr. Perhaps attributing it to Abū Dāwūd was a slip of the pen, and Allāh knows best. Then I found a supporting mursal ḥadīth for the translation from the narration of Muṣʿab ibn Shaybah from Yaḥyá ibn Jaʿdah who said: "Khālid ibn al-Walīd used to be frightened at night until he would go out with his sword..." a similar ḥadīth, and it added at the end: "Khālid said them, and it went away from him."