Through another chain it is narrated from al-Sha'bi that none of the Companions of the Messenger of Allah (peace and blessings be upon him) was stricter regarding "no marriage without a guardian" than Sayyiduna Ali bin Abi Talib (may Allah be pleased with him), to the extent that he would impose punishment in this matter.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13644