Reference: Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Volume 11, Page 233, Question 1 of Fatwa No.1775
Fataawa al-Hajj wal-‘Umrah waz-Ziyaarah – Page 77
Question: Is it permissible for one performing the Hajj or the ‘Umrah, whilst performing the tawaaf, to enter the Hajar Ismaa’eel?
Response: It is not permissible for one making tawaaf of the House (Ka’bah) during the Hajj or the ‘Umrah or voluntary tawaaf to enter the Hajar Ismaa’eel. He is not rewarded for that if he does so because the tawaaf is required around the House and the Hajar is part of the House, for that which Allaah (Subhaanahu wa Ta’aala) says:
{and make tawaaf around the ancient House}, [Soorah al-Hajj, Aayah 29].
Also, that which is narrated by Muslim and others on the authority of ‘Aa’ishah (radhi-yAllaahu ‘anhaa) who said: “I asked the Messenger of Allaah ﷺ regarding the Hajar and he said:
«it is part of the House».”
And in another wording, she said: “I vowed to pray inside the House and he ﷺ said:
«pray in the Hajar, for certainly the Hajar is part of the House…»”.
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet ﷺ and his family and his companions.