The Messenger of Allah ﷺ said, "A group of people will emerge among whom is a man with a deformed hand, or a stunted hand, or a defective hand. Were it not that you would become arrogant, I would tell you what Allah has promised, on the tongue of His Prophet ﷺ, to those who kill them."Ubayda said, I asked Ali , "Did you yourself hear this from the Messenger of Allah ﷺ?"He replied, "Yes, by the Lord of the Kaabah. Yes, by the Lord of the Kaabah. Yes, by the Lord of the Kaabah."
حدثنا وكيع حدثنا جرير بن حازم وأبو عمرو بن العلاء عن ابن سيرين سمعاه عن عبيدة
قال رسول الله ﷺ يخرج قوم فيهم رجل مودن اليد أو مثدون اليد أو مخدج اليد ولولا أن تبطروا لأنبأتكم بما وعد الله الذين يقتلونهم على لسان نبيه ﷺ قال عبيدة قلت لعلي رضي الله عنه أأنت سمعته من رسول الله ﷺ قال إي ورب الكعبة إي ورب الكعبة إي ورب الكعبة
Its isnad is sahih. Abu Amr bin Ala is trustworthy, and he is one of the well-known Quran readers. His statement, "the two of them heard it from Ubayda," means that Jareer bin Hazim and Abu Amr bin Ala heard this hadith from Ibn Sirin, who narrated it to them from Ubayda. The hadith is a repetition of 626, and see also 672 and 706.