Allah, Allah is my Lord. I do not associate anything with Him.

Reference:Abu Dawud 2/87. See also Al-Albani, Sahih Ibn Mdjah 2/335.Hisnul Muslim 125

اللهُ اللهُ رَبِّي لا أُشْـرِكُ بِهِ شَيْـئاً

Transliteration

Allāh, Allāhu Rabbī lā ushriku bihi shay'a.

Translation

Allah, Allah is my Lord. I do not associate anything with Him.