Sayyiduna Hasan bin Ali (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) taught me some words which I say in the witr (Ibn al-Jawwas says: in the qunut of witr): 'Allahumma ihdini fiman hadayt, wa 'afini fiman 'afayt, wa tawallani fiman tawallayt, wa barik li fima a'tayt, wa qini sharra ma qadayt, fa innaka taqdi wa la yuqda 'alayk, wa innahu la yadhillu man walayt, tabarakta rabbana wa ta'alayt' (O Allah, guide me among those You have guided, grant me well-being among those You have granted well-being, take me into Your care among those You have taken into Your care, bless me in what You have given me, and protect me from the evil of what You have decreed. You decree and no decree is passed against You. Whoever You befriend is never humiliated. You are Blessed, our Lord, and Exalted).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4627