Maslamah ibn Muharib reported: It was said to Ali ibn Abi Talib, may Allah be pleased with him, “What is the distance between heaven and earth?” Ali said, “An answered prayer.”
Source: al-Mujālasah wa Jawāhir al-‘Ilm 2576
عَنْ مَسْلَمَةَ بْنِ مُحَارِبٍ قَالَ قِيلَ لِعَلِيِّ بْنِ أَبِي طَالِبٍ رضي الله عنه كَمْ بَيْنَ السَّمَاءِ وَالأَرْضِ قَالَ دَعْوَةٌ مَسْتَجَابَةُ
2576 المجالسة وجواهر العلم للدينوري