Abu Sufyan bin Harb reported,

Heraclius said to him, "I asked you how your fighting against him had gone, and you said that the war swung back and forth between you, victory passing from one side to the other. That is how it is with the messengers. They are tested, and then the final outcome belongs to them."

Bukhari 2804

Sahih

حدثنا يحيى بن بكير حدثنا الليث قال حدثني يونس عن ابن شهاب عن عبيد الله بن عبد الله أن عبد الله بن عباس أخبره أن

أبا سفيان بن حرب أخبره

أن هرقل قال له سألتك كيف كان قتالكم إياه فزعمت أن الحرب سجال ودول فكذلك الرسل تبتلى ثم تكون لهم العاقبة

البخاري 2804صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Jihad and expeditions
Chapter
His saying, "Do you await for us except one of the two best things"
Numbering
Darussalam 2804
Bukhari 2804