Hilal bin Yasaf هلال بن يساف · The Book of the Commencement of the Prayer

"I heard Abu Hurairah say: 'I came back (from a journey) with the Messenger of Allah (ﷺ) and he heard a man reciting 'Say: He is Allah, (the) One, Allah-us-Samad (the Self-Sufficient Master). He begets not, nor was He begotten. And there is none equal or comparable unto Him.' The Messenger of Allah (ﷺ) said: 'It is guaranteed.' We asked him: 'What, O Messenger of Allah?' He said: 'Paradise.'"