Abu Musa Ashari reported,

Whenever the Messenger of Allah ﷺ sent any of his companions on an errand, he would say, "Give glad tidings and do not drive people away, make things easy and do not make them difficult."

Azami 12812

Sahih

عن أبي موسى الأشعري قال

كان رسول الله ﷺ إذا بعث أحدا من أصحابه في بعض أمره قال: بشروا، ولا تنفروا، ويسروا، ولا تعسروا.

الأعظمي 12812صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Tafsir of Surah Anbiya
Section
His saying, "O people, an example is set forth, so listen to it. Indeed, those you invoke besides Allah will never create even a fly, even if they gathered together for it. And if the fly should steal anything from them, they could not recover it from it. Weak is the pursuer and the pursued." That is, if all that you worship besides Allah عز وجل were to gather, they could not create a single fly, rather they could not even create an atom, as was narrated in the Sahih
Numbering
Jami al-Kamil 12812 (2nd edition)
Azami 12812