A man making tawaf of the House: those who permitted him to pray the two rak'ahs in the Ka'bah

Sayyiduna Ibn Umar (may Allah be pleased with them both) would sometimes perform tawaf and then go inside the Ka'bah and pray the two rak'ahs there.

Salim said: I saw that he performed tawaf of the Ka'bah, then entered the Ka'bah and prayed two rak'ahs.

Ja'far narrates from his father (Muhammad) that he said: My father (Ali bin Husayn) was asked about praying inside the Ka'bah, and he said: "I prayed inside the Ka'bah with my father, Sayyiduna Husayn bin Ali (may Allah be pleased with him)."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) entered the Ka'bah; Sayyiduna Usamah bin Zayd, Sayyiduna Bilal and Sayyiduna Uthman bin Talhah (may Allah be pleased with them) were with him. He (peace and blessings be upon him) stayed in the Ka'bah for a long time. Then Sayyiduna Ibn Umar (may Allah be pleased with them both) was the first of the people to enter after him. I asked Sayyiduna Bilal: "Where did the Messenger of Allah (peace and blessings be upon him) pray?" Sayyiduna Bilal said: "Between the two front pillars." The narrator said: I forgot to ask him how many rak'ahs he (peace and blessings be upon him) had prayed.

It is narrated from Sayyiduna Uthman bin Talhah (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) entered the Ka'bah, he (peace and blessings be upon him) prayed two rak'ahs on the side facing (the one who enters).