It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, al-Khidr (peace be upon him) dwells in the sea and al-Yasa' (peace be upon him) on land. These two meet every night at the great barrier which Dhu al-Qarnayn built between the people and Ya'juj and Ma'juj. Both of them also perform Hajj and Umrah every year, and drink a single draught of Zamzam water which suffices them until the following year."
This narration is very weak (da'if jiddan) in its chain.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب أحاديث الأنبياء عليهم الصلاة والسلام / 3463
Hadith Gradingمحدثین:إسناده ضعيف جدًا
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: ضَعِيفٌ جِدًّا . » «انفرد به المصنف من هذا الطريق»