"Then Abraham stayed away from them for a period as long as Allah wished and called on them afterwards. He saw Ishmael under a tree near Zam-Zam, sharpening his arrows.
When he saw Abraham, he rose up to welcome him (and they greeted each other as a father does with his son or a son does with his father). Abraham said: '0 Ishmael! Allah has given me an order.' Ishmael said: 'Do what your Lord has ordered you to do.' Abraham asked: 'Will you help me?' Ishmael said: 'I will help you.' Abraham said: 'Allah has ordered me to build a house here,' pointing to a hillock higher than the land surrounding it.
"Then they raised the foundations of the House (i.e. the Kaba). Ishmael brought the stones while Abraham built, and when the walls became high, Ishmael brought this stone and put it for Abraham, who stood over it and carried on building. While Ishmael was handing him the stones, and both of them were saying: "0 our Lord! Accept (this service) from us, verily, You are the All-Hearer, the AllKnower." Surah 2: 127