a happy mountain
親つばめ 子燕山も 幸せよ
Oya suzume ko suzume yama mo siawase yo
親雀 子雀 山もいさむぞよ 一茶
oya suzume ko suzume yama mo isamu zo yo
Literally, Issa says that the mountain is in "high spirits," "emboldened," or "inspired."
Sparrows and mountain are all inspired in fine spring day.