Dua For Protection From Shirk

اللّهُـمَّ إِنّـي أَعـوذُبِكَ أَنْ أُشْـرِكَ بِكَ وَأَنا أَعْـلَمْ، وَأَسْتَـغْفِرُكَ لِما لا أَعْـلَم

O Allah, I seek refuge in You lest I associate anything with You knowingly, and I seek Your forgiveness for what I know not.

Pronunciation: Allaahumma 'innee 'a'oothu bika 'an 'ushrika bika wa 'anaa 'a'lamu, wa 'astaghfiruka limaa laa 'a'lamu

Reference: Ahmad 4:403