For fear of shirk

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

Allahumma innee aAAoothu bika an oshrika bika wa-ana aAAlam, wa-astaghfiruka lima la aAAlam.

‘O Allah, I take refuge in You lest I should commit shirk with You knowingly and I seek Your forgiveness for what I do unknowingly.’]