Praise be to Allah.
The Black Stone was singled out by Allaah, as He prescribed for us to kiss it and touch it, and He willed that it should be set in the corner of the Ka’bah which we face when we pray. He prescribed that the people who do tawaaf should touch it and kiss it if they are able to, and if they cannot do that then they should point to it when they come in line with it, and say “Allaahu akbar.” According to a hadeeth narrated by al-Tirmidhi and others, it came down from Paradise, but there is some weakness in the isnaad of this report… (the hadeeth was narrated by al-Tirmidhi and classed as saheeh by al-Albaani in Saheeh al-Tirmidhi, 695).
And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions.