Sayyiduna Abdullah bin Amr (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Faith wears out inside a person's belly (that is, his chest or heart) just as a garment wears out, so ask (that is, supplicate to) Allah Almighty to renew the faith in your hearts."
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 158
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«أخرجه المستدرك على الصحيحين برقم: 5»
Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Renew your faith!" It was said: "O Messenger of Allah! How should we renew our faith?" The Prophet (peace and blessings be upon him) said: "Say 'La ilaha illallah' (there is no god but Allah) abundantly."
Ahmad recorded it, and its chain is jayyid (good). Its chain contains a narrator, Sumayr bin Nahar, whom Ibn Hibban (may Allah have mercy on him) declared thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 159
Hadith Gradingمحدثین:إِسْنَادُهُ جَيِّدٌ
Hadith Takhrij«اخرجه الامام احمد فى مسنده 359/2 اورده المؤلف فى زوائد المسند 4583 ، أخرجه مسند أحمد برقم: 8493»