Name #16 of 1000 · Viṣṇu Sahasranāma
क्षेत्रज्ञःkṣetrajñaḥ
Kshetrajna
Knower of the field — the body and the world
From shloka 2 · chapter Matsya
पूतात्मा परमात्मा च मुक्तानां परमा गतिः ।
अव्ययः पुरुषः साक्षी क्षेत्रज्ञोऽक्षर एव च ॥
pūtātmā paramātmā ca muktānāṃ paramā gatiḥ
avyayaḥ puruṣaḥ sākṣī kṣetrajño'kṣara eva ca
Also in this shloka: pūtātmā · paramātmā · muktānāṃ paramā gatiḥ · avyayaḥ · puruṣaḥ · sākṣī · akṣaraḥ