Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
मित्रं च शत्रुतामेति सामन्तत्वादनन्तरम् ।शत्रुं जिगीषुरुच्छिन्द्यात्स्वयं शक्नोति चेद्यदि ॥ २४ ॥
In the full Agni Purana this is chapter 233, verse 24.
A friend too turns enemy once he becomes a border neighbour. The one who wants to win should cut down the enemy himself, if he is able.
Simple meaning: A friend can turn into an enemy. A king who can do it alone should cut down the enemy himself.
पार्ष्णिग्राहमुपायैश्च शमयेच्च तथा स्वकम् ।
Calm the enemy at the rear by the right means. Using a friend to cut down an enemy is praised.
प्रतापवृद्धौ तेनापि नामत्राज्जायते भयम् ।
When the king wins by his own strength, enemies no longer frighten him. He should keep people calm and trusting.
जिगीषुर्धर्मविजयी तथा लोकं वशं नयेत् ॥ २६ ॥
A king who wins by dharma should win the people over.