Mahayana Sūtras
A number of Mahāyāna sūtras address śamatha, usually in conjunction with vipaśyanā.
One of the most prominent, the Cloud of Jewels Sutra (Ārya Ratnamegha Sutra, Tib. 'phags-pa dkon-mchog sprin-gyi mdo) divides all forms of meditation into either śamatha or vipaśyanā, defining śamatha as "single-pointed consciousness" and vipaśyanā as "seeing into the nature of things."
The Sūtra Unlocking the Mysteries (Samdhinirmocana Sūtra), a yogācāra sūtra, is also often used as a source for teachings on śamatha. The Samādhirāja Sūtra is often cited as an important source for śamatha instructions by the Kagyu tradition, particularly via commentary by Gampopa, although scholar Andrew Skilton, who has studied the Samādhirāja Sūtra extensively, reports that the sūtra itself "contains no significant exposition of either meditational practices or states of mind."
Read more about this topic: Samatha, Indo-Tibetan Tradition