The Prophet ﷺ said that Allah says, "Where are those who loved one another for the sake of My majesty? Today I shall shade them in My shade, on a day when there is no shade but Mine."
حدثنا عبد الملك بن عمرو وسريج قالا حدثنا فليح عن عبد الله بن عبد الرحمن يعني ابن معمر أبو طوالة عن سعيد بن يسار
عن النبي ﷺ قال إن الله عز وجل يقول أين المتحابون بجلالي اليوم أظلهم في ظلي يوم لا ظل إلا ظلي
Its isnad is sahih. Muslim narrated it, 4/1988, no. 2567, in the Book of Righteousness, chapter on the merit of love for the sake of Allah, and Malik narrated it, 2/234, in the chapter of comprehensive matters, on what has been said about those who love one another for the sake of Allah.