Musnad Ahmad 799:30

Hassan ibn Musa narrated to us, Zuhayr narrated to us, from Mansur, from Hilal ibn Yasaf, from Rabi’ ibn ‘Umaylah, from Samurah ibn Jundub, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The most beloved speech to Allah is four: 'La ilaha illa Allah' (There is no god but Allah), 'Allahu Akbar' (Allah is the Greatest), 'Subhan Allah' (Glory be to Allah), and 'Al-hamdu lillah' (Praise be to Allah). It does not harm you with which of them you begin." "Do not name your servant Yasar (Wealth/Ease), nor Rabah (Profit), nor Najih (Successful), nor Aflah (Most Successful), for you say: 'Is he there?' and he is not, so he says: 'No.'" "They are only four; do not add to them."