The Messenger of Allah ﷺ said, "The supplication of the fasting person is not rejected."
حدثنا وكيع حدثنا سعدان الجهني عن سعد أبي مجاهد الطائي عن أبي مدلة
قال رسول الله ﷺ الصائم لا ترد دعوته
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Its isnad is hasan. Sadan Juhani is Ibn Bishr, though it was also said Bashir, and his real name is Saeed, with Sadan being his nickname. Ibn Madini and Abu Hatim were satisfied with him. Abu Mulaika is the freed slave of Ayesha, and his name is Abdullah bin Abdullah. Ibn Hibban mentioned him in Thiqat, while Ibn Madini considered him unknown.The hadith was narrated by Tirmidhi, 4/672, no. 2526, in the Book of the Description of Paradise, in the chapter on What Has Been Said Concerning the Description of Paradise, where he said, "Its isnad is not that strong." It was also narrated by Ibn Majah, 1/557, no. 1752, by Ibn Abu Shayba, 3/7, and by Ibn Hibban, 225, no. 894, in Mawarid.