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السيوطي:٤٥٣٤a

"أُنْزِلتْ عَلَيَّ آنِفًا: يأَيها النبي إِنَّا أَرسَلْناكَ شَاهِدًا ومُبَشِّرًا ونَذِيرًا". قال: شاهِدًا على أُمَّتِك، ومُبَشِّرًا بالجَنَّةِ، ونَذِيرًا من النَّارِ، ودَاعِيًا إِلى شهادة أَن لا إِلهَ إِلا الله بإِذنه وسراجًا مُنِيرًا بالقرآن.  

الطبراني عن ابن عباس، وسنده ضعيف

See similar narrations below:

Collected by Ṭabarānī
tabarani:11841Muḥammad b. Naṣr b. Ḥumayd al-Bazzāz al-Baghdādī > ʿAbd al-Raḥman b. Ṣāliḥ al-Azdī > ʿAbd al-Raḥman b. Muḥammad b. ʿUbaydullāh al-ʿArzamī > Shaybān > Qatādah > ʿIkrimah > Ibn ʿAbbās

[Machine] When the verse {O Prophet, indeed We have sent you as a witness and a bringer of good tidings and a warner} was revealed, the Prophet ﷺ called Ali and Muadh, and their task was to go to Yemen. He said to them, "Set out and give good tidings, and do not repel people. Facilitate matters for them and do not make them difficult, for it has been revealed to me the verse {O Prophet, indeed We have sent you as a witness} to your nation, {and a bringer of good tidings} of Paradise, {and a warner} from Hellfire, {and a caller} to testify that there is no deity worthy of worship except Allah, {and a bright lamp} with the Qur'an."  

الطبراني:١١٨٤١حَدَّثَنَا مُحَمَّدُ بْنُ نَصْرِ بْنِ حُمَيْدٍ الْبَزَّازُ الْبَغْدَادِيُّ ثنا عَبْدُ الرَّحْمَنِ بْنُ صَالِحٍ الْأَزْدِيُّ ثنا عَبْدُ الرَّحْمَنِ بْنُ مُحَمَّدِ بْنِ عُبَيْدِ اللهِ الْعَرْزَمِيُّ عَنْ شَيْبَانَ عَنْ قَتَادَةَ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ

لَمَّا أُنْزِلَتْ {يَا أَيُّهَا النَّبِيُّ إِنَّا أَرْسَلْنَاكَ شَاهِدًا وَمُبَشِّرًا وَنَذِيرًا} دَعَا النَّبِيُّ ﷺ عَلِيًّا وَمُعَاذًا وَقَدْ كَانَ أَمَرَهُمَا أَنْ يَخْرُجَا إِلَى الْيَمَنِ فَقَالَ انْطَلِقَا وَبَشِّرَا وَلَا تُنَفِّرَا وَيَسِّرَا وَلَا تُعَسِّرَا فَإِنَّهُ قَدْ أُنْزِلَتْ عَلِيَّ {يَا أَيُّهَا النَّبِيُّ إِنَّا أَرْسَلْنَاكَ شَاهِدًا} عَلَى أُمَّتِكِ {وَمُبَشِّرًا} بِالْجَنَّةِ {وَنَذِيرًا} مِنَ النَّارِ {وداعيًا} إِلَى شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللهُ {وسراجًا مُنيرًا} بِالْقُرْآنِ