Ibn Jurayj (may Allah have mercy on him) narrates from Ata (may Allah have mercy on him) that the Prophet (peace and blessings be upon him) disliked taking more than what had been given from a woman who seeks khul'.
Ahmad bin Hanbal said that Waki' said: I asked Ibn Jurayj about it, and he did not recognise it and rejected it. The Shaykh (al-Bayhaqi) said: It seems he rejected it only with this wording, for the hadith is with the wording that Ibn al-Mubarak and others narrated; and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14847