Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said concerning the words of Allah Almighty, "Unless they forgo it, or forgoes it" [Surah al-Baqarah: 237]: That the woman forgoes it, or the one in whose hand is the marriage tie, that is, the guardian, forgoes it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14456