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
ahmad:19572 –

Gladden people and do not scare them; make things easy and do not make them difficult. (Using translation from Abū Dāʾūd 4835)  

أحمد:١٩٥٧٢ – قَالَ

وَكَانَ رَسُولُ اللهِ ﷺ إِذَا بَعَثَ أَحَدًا مِنْ أَصْحَابِهِ فِي بَعْضِ أَمْرِهِ قَالَ بَشِّرُوا وَلَا تُنَفِّرُوا وَيَسِّرُوا وَلَا تُعَسِّرُوا  

See similar narrations below:

Collected by Muslim, Abū Dāwūd
muslim:1732 – Abū Bakr b. Abū Shaybah And ʾAbū Kurayb Wa-al-Lafẓ Lʾabī Bakr > Abū Usāmah > Burayd b. ʿAbdullāh > Abū Burdah > Abū Mūsá

Give tidings (to the people) ; do not create (in their minds) aversion (towards religion) ; show them leniency and do not be hard upon them.  

مسلم:١٧٣٢ – حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَأَبُو كُرَيْبٍ وَاللَّفْظُ لأَبِي بَكْرٍ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ عَنْ بُرَيْدِ بْنِ عَبْدِ اللَّهِ عَنْ أَبِي بُرْدَةَ عَنْ أَبِي مُوسَى قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا بَعَثَ أَحَدًا مِنْ أَصْحَابِهِ فِي بَعْضِ أَمْرِهِ قَالَ بَشِّرُوا وَلاَ تُنَفِّرُوا وَيَسِّرُوا وَلاَ تُعَسِّرُوا  

abudawud:4835 – ʿUthmān b. Abū Shaybah > Abū Usāmah > Burayd b. ʿAbdullāh from his grandfather Abū Burdah > Abū Mūsá

Gladden people and do not scare them; make things easy and do not make them difficult.  

أبو داود:٤٨٣٥ – حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا أَبُو أُسَامَةَ حَدَّثَنَا بُرَيْدُ بْنُ عَبْدِ اللَّهِ عَنْ جَدِّهِ أَبِي بُرْدَةَ عَنْ أَبِي مُوسَى قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا بَعَثَ أَحَدًا مِنْ أَصْحَابِهِ فِي بَعْضِ أَمْرِهِ قَالَ بَشِّرُوا وَلاَ تُنَفِّرُوا وَيَسِّرُوا وَلاَ تُعَسِّرُوا