"Part of the Talbiyah of the Messenger of Allah was: 'Labbaika ilahal-haqq (Here I am, O God of truth)." (Sahih) Abu 'Abdur-Rahman (An-Nasa'i) said: I do not know of anyone who narrated a chain for this from 'Abdullah bin Al-Fadl except for 'Abdul-Aziz. Ismail bin Umayyah reported it from him in Mursal form.
كَانَ مِنْ تَلْبِيَةِ النَّبِيِّ ﷺ لَبَّيْكَ إِلَهَ الْحَقِّ قَالَ أَبُو عَبْدِ الرَّحْمَنِ لاَ أَعْلَمُ أَحَدًا أَسْنَدَ هَذَا عَنْ عَبْدِ اللَّهِ بْنِ الْفَضْلِ إِلاَّ عَبْدَ الْعَزِيزِ رَوَاهُ إِسْمَاعِيلُ بْنُ أُمَيَّةَ عَنْهُ مُرْسَلاً