It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Beware of the sins that are considered trivial, for the example of such sins is that of a people who camped in the bottom of a valley; then one man brought a stick and another brought a stick, until they had gathered enough wood to bake their bread. And indeed, the sins considered trivial, when they seize the one who commits them, destroy him."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) only with this chain, and Abd al-Wahhab is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7323
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 23272، والطبراني فى «الكبير» برقم: 5872، والطبراني فى «الصغير» برقم: 904»