Hadithcore
Riyad as-Salihin, 1325

Sahl bin Sa'd (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "Supplications at two times are never turned down (or said, "Are seldom turned down"), a supplication after the Adhan has been proclaimed, and a supplication during the battle combating the enemy." <b>[Abu Dawud]</b>.

وعن سهل بن سعد رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏

‏ثنتان لا تردان، أو قلما تردان‏:‏ الدعاء عند النداء وعند البأس حين يلحم بعضهم بعضًا‏

‏ ‏(‏‏(‏رواه أبو داود بإسناد صحيح‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 11, Hadith 41
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Among the situations in which supplications are readily answered are during battle and when the call to prayer is made.<br> 2) It points out that some times and situations are better than others in terms of answering supplications. These include the time of distress and the time of intense fighting.