Mishkat al-Masabih 2294
Samura b. Jundub reported God's messenger as saying, "The most excellent words are four:
Glory be to God; Praise be to God; there is no god but God; and God is most great." A version has, "The words dearest to God are four: Glory be to God; Praise be to God; there is no god but God; and God is most great. It does not matter which you say first." 

Muslim transmitted it.
عَنْ سَمُرَةَ بْنِ جُنْدُبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " أَفْضَلُ الْكَلَامِ أَرْبَعٌ: سُبْحَانَ اللَّهِ وَالْحَمْدُ لِلَّهِ وَلَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ "
وَفِي رِوَايَةٍ: " أَحَبُّ الْكَلَامِ إِلَى اللَّهِ أَرْبَعٌ: سُبْحَانَ اللَّهِ وَالْحَمْدُ لِلَّهِ وَلَا إِلَهَ إِلَّا اللَّهُ وَاللَّهُ أَكْبَرُ لَا يَضُرُّكَ بِأَيِّهِنَّ بَدَأْتَ ". رَوَاهُ مُسلم