Atharvaveda · Sūkta 7.61

7.61.1

यो नः शपादशपतः शपतो यश्च नः शपात् ।
वृक्ष इव विद्युता हत आ मूलादनु शुष्यतु ॥ ७.६१.१ ॥

Whoever curses us, whoever curses one who does not curse, and whoever curses us — let him dry up from the root like a tree struck by lightning.