Part of the talbiyah of the Prophet ﷺ was, "Here I am, God of Truth."Abu Abdul-Rahman said, I do not know of anyone who reported this with a connected chain from Abdullah bin Fadl except Abdul-Aziz. Ismail bin Umaya narrated it from him in mursal form.
أخبرنا قتيبة قال حدثنا حميد بن عبد الرحمن عن عبد العزيز بن أبي سلمة عن عبد الله بن الفضل عن الأعرج
كان من تلبية النبي ﷺ لبيك إله الحق قال أبو عبد الرحمن لا أعلم أحدا أسند هذا عن عبد الله بن الفضل إلا عبد العزيز رواه إسمعيل بن أمية عنه مرسلا
[Its isnad is sahih] Ibn Majah narrated it in the Book of Rites of Hajj, chapter on the talbiyah, hadith 2920, from Abdul-Aziz, with the same wording, and it is also found in al-Kubra, hadith 3733. Ibn Khuzayma graded it sahih (4/172, hadith 2623), as did Ibn Hibban (hadith 975), and Hakim, who said it meets the standard of the two sheikhs (1/449–450), and Dhahabi agreed with him. The hadith has a flaw that is deemed negligible.