It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Beware of minor sins, for they accumulate upon a man until they destroy him." The Messenger of Allah (peace and blessings be upon him) gave a parable for them thus: "Like a man who was in a desert, and the time for the people to cook came; so one man brought a stick, and another man brought a stick, until in this way they gathered a great heap of wood, then they kindled a fire and thoroughly cooked whatever was to be cooked on it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10454