Hadith 5805
وَعَنْ جَابِرٍ قَالَ: مَا سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ شَيْئًا قَطُّ فَقَالَ: لَا. مُتَّفق عَلَيْهِ
Jabir said that when God's messenger was asked for anything he never said, "No[*]." *Mirqat, 5:388, explains this as meaning that he either gave what was asked or explained why he could not, and refers to Quran, 17:28. (Bukhari and Muslim.)