Sunan Ibn Majah, Volume 3, Book 12, Hadith 2147 (DarusSalam) ⓘ
It was narrated from Anas bin Malik that the Messenger of Allah said: 'Whoever achieves at something, let him stick with It.'"
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا فَرْوَةُ أَبُو يُونُسَ، عَنْ هِلاَلِ بْنِ جُبَيْرٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَنْ أَصَابَ مِنْ شَىْءٍ فَلْيَلْزَمْهُ " .
also referenced under: Hadith 2147 (Reference) & Book 12, Hadith 2230 (In-Book)