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"Then when Talut (Saul) set out with the army, he said: "Verily! Allaah will try you by a river, So whoever drinks thereof, he is not of me, and whoever tastes it not, he is of me, except him who takes (thereof) in the hollow of his hand." Yet, they drank thereof, all, except a few of them, So when he had crossed it (the river), he and those who believed with him, they said: "We have no power this day against Jalut (Goliath) and his hosts." But those who knew with certainty that they were to meet their Lord, said: "How often a small group overcame a mighty host by Allaah's Leave?" And Allaah is with As-Sabirin (the patient ones, etc.)." [Al-Baqarah (2):249]

Narrated Abu Musa:

The Prophet was asked about things which he did not like, but when the questioners insisted, the Prophet got angry. He then said to the people, "Ask me anything you like." A man asked, "Who is my father?" The Prophet replied, "Your father is Hudhafa." Then another man got up and said, "Who is my father, O Allah's Apostle ?" He replied, "Your father is Salim, Maula (the freed slave) of Shaiba." So when 'Umar saw that (the anger) on the face of the Prophet he said, "O Allah's Apostle! We repent to Allah (Our offending you)." [The Book of Knowledge Volume 1, Book 3, Hadeeth 92]