Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Whenever any Muslim is pricked by a thorn in this world and he hopes for reward for it, then on the Day of Resurrection, because of it, surely there will be a reduction in his sins."
Hadith Referenceالادب المفرد / كتاب / 507
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه أحمد : 9219 و ابن أبى الدنيا فى المرض و الكفارات : 38 - انظر الصحيحة : 2503»