It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them) that he said: If Pharaoh were to say to me, "May Allah bless you," I would also say to him, "And to you as well," even though Pharaoh has died.
Hadith Referenceالادب المفرد / كتاب أهل الكتاب / 1113
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه ابن أبى الدنيا فى الصمت : 309 و الطبراني فى الكبير : 262/10 و أبونعيم فى الحلية : 322/1 - الصحيحة : 329/2»