Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:7742 – Hārūn b. Muḥammad b. Bakkār b. Bilāl > Muḥammad / Ibn ʿĪsá b. al-Qāsim b. Samīʿ > Zayd > Kathīr b. Murrah > Abū Fāṭimah

"O Messenger of Allah, tell me of an action that I may do and persist in it." The Messenger of Allah said to him: "You should emigrate, for there is nothing like it." (Using translation from Nasāʾī 4167)  

الكبرى للنسائي:٧٧٤٢ – أَخْبَرَنِي هَارُونُ بْنُ مُحَمَّدِ بْنِ بَكَّارِ بْنِ بِلَالٍ عَنْ مُحَمَّدٍ وَهُوَ ابْنُ عِيسَى بْنِ الْقَاسِمِ بْنِ سَمِيعٍ قَالَ حَدَّثَنَا زَيْدٌ عَنْ كَثِيرِ بْنِ مُرَّةَ أَنَّ أَبَا فَاطِمَةَ حَدَّثَهُ

أَنَّهُ قَالَ يَا رَسُولَ اللهِ حَدِّثْنِي بِعَمَلٍ أَسْتَقِيمُ عَلَيْهِ وَأَعْمَلُهُ قَالَ لِي رَسُولُ اللهِ ﷺ «عَلَيْكَ بِالْهِجْرَةِ فَإِنَّهُ لَا مِثْلَ لَهَا»  

See similar narrations below:

Collected by Nasāʾī
nasai:4167 – Hārūn b. Muḥammad b. Bakkār b. Bilāl > Muḥammad / Ibn ʿĪsá b. Sumayʿ > Zayd b. Wāqid > Kathīr b. Murrah > Abū Fāṭimah

"O Messenger of Allah, tell me of an action that I may do and persist in it." The Messenger of Allah said to him: "You should emigrate, for there is nothing like it."  

النسائي:٤١٦٧ – أَخْبَرَنِي هَارُونُ بْنُ مُحَمَّدِ بْنِ بَكَّارِ بْنِ بِلاَلٍ عَنْ مُحَمَّدٍ وَهُوَ ابْنُ عِيسَى بْنِ سُمَيْعٍ قَالَ حَدَّثَنَا زَيْدُ بْنُ وَاقِدٍ عَنْ كَثِيرِ بْنِ مُرَّةَ أَنَّ أَبَا فَاطِمَةَ حَدَّثَهُ

أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ حَدِّثْنِي بِعَمَلٍ أَسْتَقِيمُ عَلَيْهِ وَأَعْمَلُهُ قَالَ لَهُ رَسُولُ اللَّهِ ﷺ عَلَيْكَ بِالْهِجْرَةِ فَإِنَّهُ لاَ مِثْلَ لَهَا