It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once someone asked the Prophet (peace and blessings be upon him): "Which religion is the most beloved to Allah?" The Prophet (peace and blessings be upon him) replied: "The one that is most devoted solely for Allah and is broad and accommodating."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2107
Hadith Gradingحکم دارالسلام:صحيح لغيره، ابن إسحاق مدلس وقد عنعن و داود بن حصين ثقة لكن له غرائب تستنكر.