It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of the deeds (sins) that are considered trivial (small), for they keep piling up on a man until they destroy him." The Messenger of Allah (peace and blessings be upon him) gave an example of them: like a group of people who camped in a desert land, then the time came to prepare food, so each man began bringing something, and one man brought a little stick, until in this way they gathered a big heap; then they kindled a fire, and it cooked everything that had been put into it.
Hadith Referenceالمعجم الأوسط / باب الألف / 2529
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 2234، والبيهقي فى «السنن الكبرى» برقم: 20819، وأحمد فى «مسنده» برقم: 3895، والطيالسي فى «مسنده» برقم: 400، والحميدي فى «مسنده» برقم: 98، وأبو يعلى فى «مسنده» برقم: 5122، وابن أبي شيبة فى «مصنفه» برقم: 35670، والطبراني فى «الكبير» برقم: 10500»