Matsya Purana 216.25

216.25

apṛṣṭaścāsya na brūyāt kāmaṃ brūyāttathā yadi.
hitaṃ tathyañca vacanaṃ hitaiḥ saha suniścitam .. 261.26 ..

Nothing should be said without being asked, and if one says so, that ought to be true and lead to the general welfare One should always take a measure of the king's mind by his speech and then it is easy for him to act so as to please him, he is to worship the king—26 27