The Prophet ﷺ said, "There is no valid marriage without a guardian."
حدثنا محمد بن قدامة بن أعين حدثنا أبو عبيدة الحداد عن يونس وإسرائيل عن أبي إسحق عن أبي بردة
أن النبي ﷺ قال لا نكاح إلا بولي
No references are available.
[Sahih] Reported by Tirmidhi, in the chapter on Marriage, section on what has been said regarding "no marriage without a guardian," hadith no. 1101, from the hadith of Israil, with this wording. Ibn Majah also reported it, hadith no. 1881. See also the two preceding hadiths.