Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:13814Abū al-Ḥusayn b. al-Faḍl al-Qaṭṭān> ʿAbdullāh b. Jaʿfar b. Durustawayh > Yaʿqūb b. Sufyān > Ibn Bashhār > ʿAbd al-Raḥman b. Mahdī > Sufyān > Muḥammad b. Khālid > a man Yuqāl Lah al-Ḥakam > Ibn ʿAbbās

[Machine] There is no marriage except with four: a guardian, two witnesses, and a matchmaker. And he (the matchmaker) has a witness from Ibn Abbas with a broken chain of narration.  

البيهقي:١٣٨١٤أَخْبَرَنَا أَبُو الْحُسَيْنِ بْنُ الْفَضْلِ الْقَطَّانُ بِبَغْدَادَ أنبأ عَبْدُ اللهِ بْنُ جَعْفَرِ بْنِ دُرُسْتَوَيْهِ ثنا يَعْقُوبُ بْنُ سُفْيَانَ ثنا ابْنُ بَشَّارٍ ثنا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ عَنْ سُفْيَانَ عَنْ مُحَمَّدِ بْنِ خَالِدٍ عَنْ رَجُلٍ يُقَالُ لَهُ الْحَكَمُ عَنِ ابْنِ عَبَّاسٍ قَالَ

لَا نِكَاحَ إِلَّا بِأَرْبَعَةٍ وَلِيٍّ وَشَاهِدَيْنِ وَخَاطِبٍ وَلَهُ شَاهِدٌ عَنِ ابْنِ عَبَّاسٍ بِإِسْنَادٍ مُنْقَطِعٍ