On the occasion of the Battle of Badr the number of the Muslims was very small and they stood in need of every hand they could muster. Huzaifa bin-al-Yaman and Abu Husail two of his companions came to the Holy Prophet (Sallallahu Alaihi Wa Sallam) and said, “O Apostle of ALLAAH! we are just coming from Makkah. The unbelievers had captured us on the way and have released us on the condition that we do not fight on your side. We agreed under coercion, but we will certainly fight the unbelievers”. The Holy Prophet said, “Not at all! Keep your word, and leave the battle field. We (Muslims) will keep our word in all circumstances. We need the help of ALLAAH only.” (Muslim)
Hadrat Abdullah bin Abil Hammad (Radi Allaahu Ta’ala Anhu) narrated: Before his prophethood I bought something from the Holy Prophet (Sallallahu Alaihi Wa Sallam). As my money fell short I requested him to wait at the spot. And promised to come back in a while. But the matter slipped out of my mind somehow and after three days when I returned to the spot I found the Holy Prophet (Sallallahu Alaihi Wasallam) still waiting there. He only said, “You put me to great trouble. I have been waiting for you here for three days.” (Abu Daud)
In this instance we find an excellent instance of the modesty of the Holy Prophet (Sallallahu Alaihi Wa Sallam) and his faithfulness in fulfilling a promise.