Bhagavad Gita 6.42
अथवा योगिनामेव कुले भवति धीमताम्। एतद्धि दुर्लभतरं लोके जन्म यदीदृशम्।।6.42।।
athavā yogināmeva kule bhavati dhīmatām| etaddhi durlabhataraṃ loke janma yadīdṛśam||6.42||
athava yoginameva kule bhavati dhimatam etaddhi durlabhataram loke janma yadidrisham6.42
Meaning
Or, such a yogi may be born into a family of wise yogis. Such a birth is extremely rare and precious in this world.
अथवा, (साधक) ज्ञानवान् योगियों के ही कुल में जन्म लेता है, परन्तु इस प्रकार का जन्म इस लोक में निःसंदेह अति दुर्लभ है।
This is verse 42 of 47 in Chapter 6 (Dhyana Yoga) of the Bhagavad Gita.