It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "The five prayers are an expiation for (the sins of) the intervals between them." And the Messenger of Allah (peace and blessings be upon him) said: "What do you think: if a man had a place of work, and between his house and his place of work there were five rivers; when he goes to his place of work and does work there as Allah wills, from which dirt or sweat afflicts him, and then every time he passes a river he bathes, would this leave any of his dirt? Likewise is the case of the prayers: whenever the servant commits a sin, or whatever Allah wills, and then he prays, supplicates and seeks forgiveness, those sins of his are forgiven."
This hadith is not narrated from Sayyiduna Abu Sa'id (may Allah be pleased with him) except with this chain, and Yahya bin Ayyub is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الألف / 198
Hadith Gradingمحدثین:إسناده لا بأس به
Hadith Takhrij«قال الهيثمي: فيه عبد الله بن قريظ ذكره ابن حبان في الثقات وبقية رجاله رجال الصحيح «مجمع الزوائد ومنبع الفوائد، ج 1، ص 298»» «قال ابن حجر: إسناد لا بأس به «فتح الباري شرح صحيح البخاري، ج 2، ص 16»» «قال بدر الدين العيني: إسناد لا بأس به من طريق عطاء بن يسار عنه «عمدة القاري شرح صحيح البخاري، ج 5، ص 16»» «قال ابن عبد البر: محفوظ من طرق صحاح ثابتة «التمهيد لما في الموطأ من المعاني والأسانيد، ج 24، ص 220»» «أخرجه الطبراني فى «الكبير» برقم: 5444»