Show leniency (to the people) ; don't be hard upon them; give them glad tidings (of Divine favours in this world and the Hereafter) ; and do not create aversion. Work in collaboration and don't be divided.
أَنَّ النَّبِيَّ ﷺ بَعَثَهُ وَمُعَاذًا إِلَى الْيَمَنِ فَقَالَ يَسِّرَا وَلاَ تُعَسِّرَا وَبَشِّرَا وَلاَ تُنَفِّرَا وَتَطَاوَعَا وَلاَ تَخْتَلِفَا
That his father said, "The Prophet ﷺ sent Muʿadh and Abu Musa to Yemen telling them. 'Treat the people with ease and don't be hard on them; give them glad tidings and don't fill them with aversion; and love each other, and don't differ."
أَنَّ النَّبِيَّ ﷺ بَعَثَ مُعَاذًا وَأَبَا مُوسَى إِلَى الْيَمَنِ قَالَ يَسِّرَا وَلاَ تُعَسِّرَا وَبَشِّرَا وَلاَ تُنَفِّرَا وَتَطَاوَعَا وَلاَ تَخْتَلِفَا
"يَسِّرَا وَلَا تُعَسِّرا، وبَشِّرَا وَلَا تُنَفِّرَا، وَتَطَاوَعَا وَلَا تَخْتَلِفَا".