Srimad Bhagavatam
आन्वीक्षिकी त्रयी वार्ता दण्डनीतिस्तथैव च । एवं व्याहृतयश्चासन् प्रणवो ह्यस्य दह्रतः ॥ ३-१२-४४ ॥
The science of logical argument, the Vedic goals of life, and also law and order, moral codes and the celebrated hymns bhūḥ, bhuvaḥ and svaḥ all became manifested from the mouths of Brahmā, and the praṇava oṁkāra was manifested from his heart. ॥ 3-12-44 ॥
english translation
तर्कशास्त्र विज्ञान, जीवन के वैदिक लक्ष्य, कानून तथा व्यवस्था, आचार संहिता तथा भू: भुव: स्व: नामक विख्यात मंत्र—ये सब ब्रह्मा के मुख से प्रकट हुए और उनके हृदय से प्रणव ॐकार प्रकट हुआ। ॥ ३-१२-४४ ॥
hindi translation
AnvIkSikI trayI vArtA daNDanItistathaiva ca । evaM vyAhRtayazcAsan praNavo hyasya dahrataH ॥ 3-12-44 ॥
hk transliteration by Sanscript