"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. (Using translation from Nasāʾī 2752)
كَانَ مِنْ تَلْبِيَةِ النَّبِيِّ ﷺ «لَبَّيْكَ إِلَهَ الْحَقِّ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ لَا أَعْلَمُ أَحَدًا أَسْنَدَ هَذَا الْحَدِيثَ غَيْرَ عَبْدِ اللهِ بْنِ الْفَضْلِ وَعَبْدُ اللهِ بْنُ الْفَضْلِ ثِقَةٌ خَالَفَهُ إِسْمَاعِيلُ بْنُ أُمَيَّةَ