Authentic Supplication Number 147.

The Messenger of Allah  used to solicit protection for Al-Hasan and Al-Hussein, may Allah be pleased with them [saying]: ‘U`eethukuma bikalimatil-lahi ‘at-tammati min kulli shaytanin wa hammatin, wa min kulli `eynin lammatin (166) and he would say: Your forefather (speaking to the two) used to solicit protection for Isma`eel and Ishaq with this supplication.

Footnotes.
(166) I solicit the protection of the two of you in the perfect, and complete Words of Allah from every shaytan and venomous reptile, and from every evil eye.

Reporters.
Reported by Al-Bukhari. Al-Albani included this hadeeth in The Authentic of Good Sayings as #118.