It is narrated from Mu’adh bin Anas, from his father, who said: The Messenger of Allah (peace and blessings be upon him) said: “Whoever, when wearing new clothes, says: «اَلْحَمْدُلِلّٰهِالَّذِيْكَسَانِيْهٰذَاوَرَزَقَنِيْهٖمِنْغَيْرِحَوْلٍمِنِّىْوَلَاقُوَّةٍ», his past sins will be forgiven.”
(Translation) All praise is due to Allah alone, Who has clothed me with this garment and granted it to me without any power or strength from myself.
Hadith Referenceسنن دارمي / من كتاب الاستئذان / 2725
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده حسن وأبو مرحوم هو: عبد الرحيم بن ميمون، [مكتبه الشامله نمبر: 2732]
Hadith Takhrijاس حدیث کی سند حسن ہے۔ دیکھئے: [أبوداؤد 4023] ، [ترمذي 3454] ، [أحمد 439/3] ، [الحاكم 507/1] ، [ابن السني فى عمل اليوم و الليلة 271]