Shatapatha Brahmana 4.3.1.14

4.3.1.14

athāto gṛhṇātyeva | upayāmagṛhīto 'si madhave tvetyevādhvaryurgṛhṇātyupayāmagṛhīto 'si mādhavāya tveti pratiprasthātaitāveva vāsantikau sa yadvasanta oṣadhayo jāyante vanaspatayaḥ pacyante teno haitau madhuśca mādhavaśca

Now he draws the cups (for the seasons) therefrom, with (Vâg. S. VII, 30), 'Thou art taken with a support: thee for Madhu!' the Adhvaryu takes (the first); with 'Thou art taken with a support: thee for Mâdhava!' the Pratiprasthâtri (the second). These two are the spring (months): because in spring plants sprout and trees are brought to ripeness, therefore these two are Madhu (sweet) and Mâdhava.