Ata bin Abi Rabah (may Allah have mercy on him) says regarding the establishment of testimony: When the witnesses have given their testimony, then after that they should not deny it.
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 459
Hadith Gradingمحدثین:سنده ضعيف لضعف أبي عامر من قبل حفظه، وهو حسن لغيره كما سيأتي.