ENOfficial
Anas reported God’s Messenger as saying, “A supplication made between the adhan and the iqama is not rejected.” Abu Dawud and Tirmidhi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يُرَدُّ الدُّعَاءُ بَيْنَ الْأَذَان وَالْإِقَامَة» . رَوَاهُ أَبُو دَاوُد وَالتِّرْمِذِيّ
sunnah.com