Musnad Ahmad 31:293

Waki’ narrated to us, from al-A’mash, from Abu Salih, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Noah (peace be upon him) will be called on the Day of Resurrection, and it will be said to him: 'Did you convey [the message]?' He will say: 'Yes.' Then his people will be called, and it will be said to them: 'Did he convey [the message] to you?' They will say: 'No warner came to us'—or: 'No one came to us.' He said: Then it will be said to Noah: 'Who will testify for you?' He will say: 'Muhammad and his nation.' He said: That is His saying: {And thus We have made you a just nation} [Al-Baqarah: 143]. He said: The 'just' (al-wasat) is the upright (al-‘adl). He said: Then they will be called, and they will testify for him regarding the conveyance [of the message]. He said: Then I will testify concerning you."