It is narrated from Sayyiduna Salamah bin Nu'aym al-Ashja'i (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever says 'La ilaha illallah' (there is no god but Allah) will enter Paradise."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6319