Hadith 782:16
Muhammad ibn Mus'ab narrated to us, Abu Bakr narrated to us, from 'Atiyyah, from 'Amr ibn 'Abasah, that the Prophet (peace and blessings of Allah be upon him) said: "The night prayer is two by two, and the latter part of the night is the most likely to be answered in supplication." He said: So I said: "Is it the most likely to be answered (ajwabu)?" He said: "No, but the most likely to be answered (awjabu)," meaning by that the response (al-ijabah).
حدثنا محمد بن مصعب، حدثنا أبو بكر، عن عطية، عن عمرو بن عبسة، أن النبي صلى الله عليه وسلم قال: " صلاة الليل مثنى مثنى، وجوف الليل الآخر أوجبه دعوة " قال: فقلت: أجوبه؟ قال: " لا ولكن أوجبه يعني بذلك الإجابة "