Saad bin Abu Waqqas reported,

I was the first Arab to shoot an arrow in the cause of Allah. I remember when we used to go on military campaigns with nothing to eat but the leaves of the hubla tree and this samur tree, so that one of us would relieve himself like a sheep, his droppings unmixed. Now the tribe of Banu Asad seeks to instruct me about Islam. If that were so, I would have failed and my efforts would have been in vain.

Bukhari 6453

Sahih

حدثنا مسدد حدثنا يحيى عن إسماعيل حدثنا قيس قال سمعت

سعدا يقول

إني لأول العرب رمى بسهم في سبيل الله ورأيتنا نغزو وما لنا طعام إلا ورق الحبلة وهذا السمر وإن أحدنا ليضع كما تضع الشاة ما له خلط ثم أصبحت بنو أسد تعزرني على الإسلام خبت إذا وضل سعيي

البخاري 6453صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Softening of hearts
Chapter
How the Prophet ﷺ and his companions lived, and their renunciation of worldly life
Numbering
Darussalam 6453
Bukhari 6453