SB 8.19.19
mam vacobhih samaradhya
lokanam ekam isvaram
pada-trayam vrnite yo
’buddhiman dvipa-dasusam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
I am able to give You an entire island because I am the proprietor of the three divisions of the universe. You have come to take something from me and have pleased me by Your sweet words, but You are asking only three paces of land. Therefore You are not very intelligent.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
According to Vedic understanding, the entire universe is regarded as an ocean of space. In that ocean there are innumerable planets, and each planet is called a dvipa, or island. When approached by Lord Vamanadeva, Bali Maharaja was actually in possession of all the dvipas, or islands in space. Bali Maharaja was very pleased to see the features of Vamanadeva and was ready to give Him as much land as He could ask, but because Lord Vamanadeva asked only three paces of land, Bali Maharaja considered Him not very intelligent.