It is narrated from Hazrat Sahl bin Sa’d (may Allah be pleased with him), with reference to Ubayy bin Ka’b (may Allah be pleased with him), that a person asked about the mosque which was founded on piety, so the Holy Prophet (peace and blessings be upon him) said: It refers to my mosque.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21106
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف، فيه عبدالله بن عامر متفق على ضعفه