WHEN A SUPPLICATION IS NOT REJECTED H 1057 "A supplication made between the Adhan (first) call to prayer and the Iqamah (second) call to prayer is not rejected." R 1057 Abu Daud and Tirmidhi with a chain up to Anas who related that the Messenger of Allah, praise and peace be upon him, said this.
1041- وعن أنس رضي الله عنه ، قَالَ : قَالَ رسول الله صلى الله عليه وآله وسلم : "الدُّعَاءُ لاَ يُرَدُّ بَيْنَ الأَذَانِ وَالإقَامَةِ" رواه أَبُو داود والترمذي ، وقال : "حديث حسن" .