Sunan an-Nasa'i, Volume 3, Book 23, Hadith 2595 (DarusSalam) ⓘ
It was narrated from 'Amr bin Shu'aib, from his father, that his grandfather said: "The Messenger of Allah said: 'Whoever asks when he has forty Dirhams I being too demanding when asking."'
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ أَنْبَأَنَا يَحْيَى بْنُ آدَمَ، عَنْ سُفْيَانَ بْنِ عُيَيْنَةَ، عَنْ دَاوُدَ بْنِ شَابُورَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ سَأَلَ وَلَهُ أَرْبَعُونَ دِرْهَمًا فَهُوَ الْمُلْحِفُ " .
also referenced under: Hadith 2594 (Reference) & Book 23, Hadith 0 (In-Book)