It is narrated from Amr bin Maymun (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you loves a person (a servant of Allah), let him inform him of it, for that other person will certainly find in his heart the same feelings and love for him as this one feels for him."
This narration is mursal.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الأدب / 2755
Hadith Gradingمحدثین:إسناده مرسل
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: مُرْسَلٌ . » «انفرد به المصنف من هذا الطريق»