It is narrated from Sayyiduna Ali (may Allah be pleased with him) that (once I was present in the service of the Prophet ﷺ) when Sayyiduna Ammar (may Allah be pleased with him) came and began to seek permission to enter. The Prophet ﷺ said: "Grant him permission, welcome to the person who is pure and possesses purity."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 1033
Hadith Gradingحکم دارالسلام:إسناده صحيح، قاله أحمد شاكر