Musannaf Ibn Abi Shayba 27:223

Waki’ narrated to us, he said: Al-A’mash narrated to us, from Al-Minhal, from Sa’id ibn Jubayr, from Ibn Abbas: "And indeed, I will send to them a gift" (27:35). He said: She sent gold or a brick of gold. When they arrived, the walls of the city were of gold. That is the meaning of his saying: "Do you provide me with wealth? But what Allah has given me is better than what He has given you" (27:36) – the verse.