It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) went to visit a sick man of the Ansar. When he (peace and blessings be upon him) came near his house, he heard him talking inside the house. Then, when he (peace and blessings be upon him) had asked permission and entered, he did not find anyone there. The Messenger of Allah (peace and blessings be upon him) asked him: "I heard you talking to someone else?" He said: "O Messenger of Allah! Because of the fever that afflicts me, I was secluded in a corner, grieved by people's talk, when a visitor came to me. After you (peace and blessings be upon him), I have never seen anyone more honourable to sit with or better in conversation than him." He (peace and blessings be upon him) said: "That was Jibril (peace and blessings be upon him). And indeed, among you there are men such that if one of them swore an oath by Allah, the Mighty and Majestic, Allah Almighty would certainly fulfil it."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) except with this chain, and no one narrated it except Muhammad bin Abd al-Wahib (may Allah have mercy on him)."
This is how it is in the printed Dar al-Haramayn edition, and the editor has indicated that it is the same in the manuscript and in one of the two copies of Majma' al-Zawa'id, while the other copy has the word "la-rijalan", and that is correct.
Hadith Referenceالمعجم الأوسط / باب الألف / 2717
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«قال الهيثمي: أسانيدهم حسنة «مجمع الزوائد ومنبع الفوائد، ج 10، ص 41»» «أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 103، والبزار فى «مسنده» برقم: 5040، والطحاوي فى «شرح مشكل الآثار» برقم: 673، والطبراني فى «الكبير» برقم: 12321»