I highly doubt it is “a line Laputa said” but rather a line from Laputa (the movie), presumably this one: https://dic.pixiv.net/a/%E4%BA%BA%E3%81%8C%E3%82%B4%E3%83%9F%E3%81%AE%E3%82%88%E3%81%86%E3%81%A0
The current Disney dub seems to have left the line out entirely (and is subtitled as “die you insects!” on Netflix) but in the old dub it was something like “from up here you all look like ants!”