The Long Āgama Sūtra 2.21

2.21

「阿難！若能爾者，長幼和順，轉更增盛，其國久安，無能侵損。」

“Ānanda, if they do that, then the elders and the youth will be in accord, and that’ll make them flourish. Their country will be safe for a long time. They’ll be impossible to conquer.”