say call upon allah or call upon rahman by whatever name ye call upon him for to him belong the most beautiful names. neither speak thy prayer aloud nor speak it in a low tone but seek a middle course between.
قل ادعوا الله أو ادعوا الرحمن أيا ما تدعوا فله الأسماء الحسنى ولا تجهر بصلاتك ولا تخافت بها وابتغ بين ذلك سبيلا