法華義疏 2.213

2.213

「又見菩薩」下，次明重施。如光明王千頭布施，提婆菩薩以眼布施，摩訶薩埵以身布施。「欣樂施與」者，如人以瓦器換得寶瓶心生欣樂，捨此肉身得於法身義亦如是。

From "Also seeing bodhisattvas" onward next clarifies major giving. This is like King Prabhāsa giving away a thousand heads, Bodhisattva Āryadeva giving away his eyes, or Mahāsattva giving away his body. Regarding "delighting in bestowing": just as someone who exchanges an earthenware vessel for a precious vase feels delight in his heart, relinquishing this fleshy body to attain the dharmakāya is also like this.