حَدَّثَنَا مُحَمَّدُ بْنُ الْحَسَنِ بْنِ أَحْمَدَ بْنِ الْوَلِيدِ رَضِيَ اللَّهُ عَنْهُ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ الْحَسَنِ الصَّفَّارُ عَنْ يَعْقُوبَ بْنِ يَزِيدَ عَنْ مُحَمَّدِ بْنِ أَبِي عُمَيْرٍ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ أَبَانِ بْنِ تَغْلِبَ قَالَ قَالَ أَبُو عَبْدِ اللَّهِ ع أَوَّلُ مَنْ يُبَايِعُ الْقَائِمَ ع جَبْرَئِيلُ يَنْزِلُ فِي صُورَةِ طَيْرٍ أَبْيَضَ فَيُبَايِعُهُ ثُمَّ يَضَعُ رِجْلًا عَلَى بَيْتِ اللَّهِ الْحَرَامِ وَ رِجْلًا عَلَى بَيْتِ الْمَقْدِسِ ثُمَّ يُنَادِي بِصَوْتٍ طَلِقٍ تَسْمَعُهُ الْخَلَائِقُ أَتى أَمْرُ اللَّهِ فَلا تَسْتَعْجِلُوهُ
Narrated to us Muhammad bin Hasan bin Ahmad bin Walid (r.a.): Narrated to us Muhammad bin Hasan Saffar from Yaqoob bin Yazid from Muhammad bin Abi Umair from Aban bin Uthman from Aban bin Taghlib that he said: Abu Abdillah 
said:
“The first to pledge allegiance to Qaim is Jibraeel who would come down in the form of a white bird and give him oath of allegiance. Then keeping one foot on the Holy Kaaba and another on the Holy Qods issue such a loud call that when the creatures hear it they would cry:
أَتَىٰ أَمْرُ اللَّهِ فَلَا تَسْتَعْجِلُوهُ
“Allah’s commandment has come, therefore do not desire to hasten it.”28
