The Messenger of Allah ﷺ said, "There is no marriage except with a guardian."
حدثنا وكيع وعبد الرحمن عن إسرائيل عن أبي إسحاق
قال رسول الله ﷺ لا نكاح إلا بولي
No references are available.
Its isnad is sahih, and it is found in Abu Dawud 2/568, no. 2085, Tirmidhi 3/398, no. 1101, Ibn Majah 1/605, no. 1881, and Darimi 2/184, no. 2182. Hakim graded it sahih in 2/169, and Dhahabi agreed with him. All of them have it in the book of marriage.