Aishah (May Allah be pleased with her) reported: The Messenger of Allah, (Sallallahu Alyhi Wa Sallam) appointed a man in charge of an army unit who led them in Salaah (prayer); he always concluded his recitation with Surat Al-Ikhlas: "Say (O Muhammad (Sallallahu Alyhi Wa Sallam): 'He is Allah, (the) One. Allah-us-Samad (Allah – the Self-Sufficient). He begets not, nor was He begotten. And there is none equal or comparable to Him.''' (112:1-4) Upon their return to Al-Madinah, they mentioned this to Messenger of Allah (Sallallahu Alyhi Wa Sallam), who said, "Ask him why he does so?'' He was asked and he said, "This Surah contains the Attributes of Allah, the Gracious, and I love to recite it. Messenger of Allah (Sallallahu Alyhi Wa Sallam) then told them, "Tell him that Allah loves him". [Al-Bukhari and Muslim]

Commentary: We learn from the Hadith the following:
1. The Companions always rushed to the Prophet (Sallallahu Alyhi Wa Sallam) to ask his opinion about anything they noticed strange to them.
2. The superiority of Surah Al-Ikhlas as it clarifies points of Tauhid.
3. The permissibility to recite two Surah during Salaah, apart from Surah Al-Fatihah, in one single Rak`ah.