Arthashastra
"दण्ड मित्र व्यसनयोर् मित्र व्यसनम्" इति वातव्याधिः ॥
Vátavyádhi says that of the distress of the army and of an ally, the distress of an ally is more serious--an ally.
english translation
"daNDa mitra vyasanayor mitra vyasanam" iti vAtavyAdhiH ॥
hk transliteration by Sanscript