It is narrated from Sayyiduna Abu Huraira (may Allah be pleased with him), he used to say: I came with the Messenger of Allah (peace and blessings be upon him), and he heard a man reciting «﴿قُلْ هُوَ اللّٰهُ أَحَدٌ﴾» . He said: "It has become obligatory." I asked: "What has?" He said: "Paradise." Sayyiduna Abu Huraira (may Allah be pleased with him) said: I wanted to go and give this man the glad tidings, but I feared that my morning meal with the Messenger of Allah (peace and blessings be upon him) would be lost, so I ate first, then I went, but I saw that the man had gone.