It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) recited (the word "sa'altuka") with two hamzahs: "He said: If I ask you about anything after this (then do not keep me in your company)." [Surah al-Kahf: 76] This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. The two of them only agreed on the narration of Amr bin Dinar, in which the story of Sayyiduna Musa and al-Khadir (peace be upon them) is given in detail, but it does not mention the two hamzahs.