ॐ येनेदं भूतं भुवनं भविष्यत् , परिगृहीतं अमृतेन सर्व I
येन यग्यस्ताय्ते सप्तहोता, तन्मे मनः शिवसंकल्पमस्तु II

ऋषि : विश्वामित्र यजुर्वेद : ३४.४

O Lord! The immortal mind by which actions of the past, present and future come into form, and which is at the helm of seven functions (saptahotri yajna ) respiration, sight, hearing, speech, taste, touch and walking (all actions of a person are inspired by mind ), such mind of mine must be of pure thoughts.

Source: Yajurveda 34.4, Rishi Vishvamitra