قُلِ ادْعُواْ اللّهَ أَوِ ادْعُواْ الرَّحْمَنَ أَيًّا مَّا تَدْعُواْ فَلَهُ الأَسْمَاء الْحُسْنَى وَلاَ تَجْهَرْ بِصَلاَتِكَ وَلاَ تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَلِكَ سَبِيلاً
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سورة الإسراء
(17/110) Say thou: call upon Allah or call upon Rahman, by whichsoever ye call, His are the excellent names. And shout not thy prayer, nor speak it low, but Seek between these a way.
Surah Al-Isra