A man said to Sayyiduna al-Bara' bin Azib (may Allah be pleased with him): I charged at an army of a thousand; is that destruction? Al-Bara' (may Allah be pleased with him) said: No. Destruction is that a person commits a sin, then sinks deep into it and says: I will not be forgiven.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17926