It is narrated from Ibrahim (may Allah have mercy on him) that a man gave his wife the right of choice by writing her a letter. The wife placed the letter under her pillow and said nothing. So he said: "Now she has no choice."
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2808
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 1630، وابن أبى شيبة فى «مصنفه» برقم: 19555»