Mukhtasar Bukhari (Abridged) 2097 — Deeds done purely for Allah’s

Narrated from Sayyiduna Utban bin Malik Ansari, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "Whoever says 'La ilaha illallah' purely for the sake of Allah, then on the Day of Resurrection, the fire of Hell will be forbidden for him."