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لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ, لَبَّيْكَ لاَ شَرِيكَ لَكَ لَبَّيْكَ, إِنَّ الْحَمْدَ, وَالنِّعْمَةَ, لَكَ وَالْمُلْكَ, لاَ شَرِيكَ لَكَ
(Here I am O Allah, (in response to Your call), here I am. Here I am, You have no partner, here I am. Verily all praise, grace and sovereignty belong to You. You have no partner.)
Source: Al-Bukhari, Muslim 2/841.