It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Allah Almighty said: Whoever shows enmity to a friend (wali) of Mine has declared war against Me. My servant does not draw near to Me with anything more beloved to Me than what I have made obligatory upon him, and he continues to draw near to Me with voluntary deeds until I love him. Then, when I love him, I become his hearing with which he hears, his sight with which he sees, his hand with which he grasps, and his foot with which he walks. If he asks of Me, I will surely give to him, and if he seeks refuge with Me, I will surely grant him refuge."
Imam Bukhari narrated this hadith in his Sahih from Muhammad bin Uthman bin Karamah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6395