The Prophet (SAW) used to seek Allah's protection for Al-Hasan and Al-Husain by saying:

أُعيـذُكُمـا بِكَلِـماتِ اللهِ التّـامَّة، مِنْ كُلِّ شَيْـطانٍ وَهـامَّة، وَمِنْ كُـلِّ عَـيْنٍ لامَّـة

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146. 'U'eethukumaa bikalimaatil-laahit-taammati min kulli shaytaanin wa haammatin, wa min kulli 'aynin laammatin.

I seek protection for you in the Perfect Words of Allah from every devil and every beast , and from every envious blameworthy eye.

Reference:

Al-Bukhari4/119.