SB 4.18.28
tato mahipatih pritah
sarva-kama-dugham prthuh
duhitrtve cakaremam
premna duhitr-vatsalah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter King Prthu was very satisfied with the planet earth, for she sufficiently supplied all food to various living entities. Thus he developed an affection for the planet earth, just as if she were his own daughter.