वेदः स्मृतिः सदाचारः स्वस्य च प्रियमात्मनः।
एतच्चतुर्विधं प्राहुः साक्षाद्धर्मस्य लक्षणम्॥
vedaḥ smṛtiḥ sadācāraḥ svasya ca priyamātmanaḥ|
etaccaturvidhaṁ prāhuḥ sākṣāddharmasya lakṣaṇam||
The Vedas, the Smritis (authoritative texts on Dharma, like Manusmriti etc), good practices/conduct (as practised by the learned, elders), the happiness of one’s own mind.
These four are said to be the characteristics of Dharma.
[Adapted from the excellent blog @ http://samskrute.blogspot.com/2009/03/13.html%5D