Sayyidah al-Shamus bint al-Nu'man (may Allah be pleased with her) said: I saw the Prophet (peace and blessings be upon him) laying the foundation of the Quba Mosque. Sometimes I would see him carrying a heavy stone, pressing it against his stomach, and we would come to take the stone from him, but he would say: "Leave it, and carry another." And Jibril (peace be upon him) was guiding him toward the Ka'bah.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21171