It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: "Indeed, this corner of the Ka'bah is the right hand of Allah Almighty on the earth, with which He shakes hands with His servants just as a man shakes hands with his brother."
This report is mawquf, and its chain is sahih (authentic).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الحج / 1223
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: هَذَا مَوْقُوفٌ صَحِيحٌ . » «أخرجه مصنف عبد الرزاق برقم: 8878»