English translation
2940. Narrated 'Abdullāh bin 'Abbas رَضِيَ اللَّهُ عَنْهُمَا: Allāh's Messenger ﷺ wrote to Caesar and invited him to Islām, and sent him his letter with Dihya Al-Kalbī whom Allāh's Messenger ﷺ ordered to hand it over to the Governor of Baṣrah, who would forward it to Caesar. Caesar, as a sign of gratitude to Allāh, had travelled from Himṣ to Ilyā (Jerusalem) when Allāh had granted him victory over the Persian forces. So, when the letter of Allāh's Messenger ﷺ reached Caesar, he said after reading it, "Seek for me any one of his people (Arabs of Quraish tribe) if present here, in order to ask him about Allāh's Messenger ﷺ."
