Mahabharata 8.63.18

उभौ वरायुधधरावुभौ रणकृतश्रमौउभौ च बाहुशब्देन नादयन्तौ नभस्तलम्

ubhau varāyudhadharāvubhau raṇakṛtaśramauubhau ca bāhuśabdena nādayantau nabhastalam

Our plain-language meaning of this verse is waiting for scholar review.