Al-Bayhaqī also transmitted this report from al-Ḥākim, from al-Aṣamm, from Aḥmad ibn ʿAbd al-Jabbār, from Yūnus ibn Bukayr, from Abū Maʿshar, from Saʿīd al-Maqburī. He mentioned ʿAbdullāh ibn Salām’s questions but stated that he asked about the dark patch on the moon instead of the portents of the Hour. The narration continues until it says:

“As for the blackness you see on the moon: the sun and the moon were once two suns. Then Allah—Most Exalted—said, ‘We have made the night and the day as two signs; then We effaced the sign of the night’ (al-Isrāʾ 17:12). The darkness you observed is that very effacement.”

At this, ʿAbdullāh ibn Salām declared, “I bear witness that there is no deity but Allah and that Muḥammad is the Messenger of Allah.”(2)

Another ḥadīth to the same effect:
Al-Ḥāfiẓ al-Bayhaqī said: Abū Zakariyyā Yaḥyā ibn Ibrāhīm al-Muzakkī informed us; Abū l-Ḥasan Aḥmad ibn Muḥammad ibn ʿAbdūs narrated to us; ʿUthmān ibn Saʿīd related to us; al-Rabīʿ ibn Nāfiʿ—Abū Tūbah—told us; Muʿāwiyah ibn Sallām reported from Zayd ibn Sallām, who heard Abū Sallām say: Abū Asmāʾ al-Raḥabī told me that Thawbān related:

“I was standing beside the Messenger of Allah ﷺ when a rabbi from among the Jews came and said, ‘Peace be upon you, O Muḥammad.’ I gave him a shove that nearly knocked him over. He asked, ‘Why did you push me?’ I replied, ‘Will you not say, “O Messenger of Allah”?’ He answered, ‘I merely called him by the name his family gave him.’ The Messenger of Allah ﷺ then said,

‘My name—the name with which my family named me—is Muḥammad.’

The Jew said, ‘I have come to question you.’ The Messenger of Allah ﷺ asked,

‘Will anything I tell you benefit you?’

He replied, ‘I will listen with my own ears.’ The Prophet struck the ground with a twig he was holding and said, ‘Ask.’

The Jew asked, ‘Where will people be on the Day when the earth is changed to another earth, and the heavens likewise?’ The Messenger of Allah ﷺ answered,

‘In darkness, short of the Bridge.’

He asked, ‘Who will be the first to cross it?’ He replied,

‘The poor among the Emigrants.’

He said, ‘What will be their gift when they enter Paradise?’ He said,

‘The caudate lobe of the fish’s liver.’

He asked, ‘And what food will follow that?’ He answered,

‘A bull of Paradise will be slaughtered for them—one that used to graze along its borders.’

He asked, ‘What will they drink with it?’ He said,

‘From a spring therein called Salsabīl.’

The Jew said, ‘You have spoken the truth.

‘I have also come to ask you about something that no one on earth knows except a prophet—or one man, or at most two.’ The Prophet said,

‘Will it benefit you if I inform you?’

He replied, ‘I will listen with my own ears.’ He said, ‘I have come to ask you about the child.’

The Prophet said,

‘The man’s fluid is white and the woman’s fluid is yellow. When they come together, if the man’s fluid prevails over the woman’s, then—by Allah’s permission—the child will be male; and if the woman’s fluid prevails over the man’s, the child will be female.’(3)