Tafsir of Al-Quraish 106:3

(Let them worship the Lord of this House): It is the Ka'bah, which was protected from the People of the Elephant. It is narrated from 'Umar that he led the people in prayer in Makkah at the Ka'bah; when he recited, "Let them worship the Lord of this House," he gestured with his finger toward it while he was in prayer before Allah, the Exalted.