It is narrated from Sayyiduna Samurah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The speech most beloved to Allah, the Mighty and Majestic, is: Subhanallah (glory be to Allah), Alhamdulillah (all praise is for Allah), La ilaha illallah (there is no god but Allah), and Allahu akbar (Allah is the Greatest). It does not harm you with which of them you begin."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6762