Kautilya's Arthashastra 7.8.6

7.8.6

mitropakāram amitropaghātam arthānubandham avekṣamāṇaḥ pūrvopakārakaṃ kārayitukāmo bhūyas tadātve mahāntaṃ lābham utsṛjyāyatyām alpam icchet //

When a king has in view the necessity of helping a friend or of destroying an enemy, or the possibility of acquiring much wealth (in return for the present help) or when he intends to utilize in future the services of the one now obliged by him, he may reject the offer of large profit at the present in preference of a small gain in future.