Sayyiduna Abu Musa (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no marriage without a guardian."
This narration differs from the narration of Abu Zakariyya, which he reported from Ahmad bin Salman; it is as if our shaykh Abu Abdullah carried the hadith of Ibn Qutaybah over onto the hadith of Asbat.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13629