Shatapatha Brahmana 6.6.2.11

6.6.2.11

sā kārmukī syāt | devāścāsurāścobhaye prājāpatyā aspardhanta te devā agnimanīkaṃ kṛtvāsurānabhyāyaṃstasyārciṣaḥ pragṛhītasyāsurā agram prāvṛścaṃstadasyām pratyatiṣṭhatsa kṛmuko 'bhavattasmātsa svādū raso hi tasmādu lohito 'cirhi sa eṣo 'gnireva yatkṛmuko 'gnimevāsminnetatsambhūtiṃ dadhāti

It should be one of krimuka wood. Now, the gods and the Asuras, both of them sprung from Pragâpati, strove together. The gods, having placed Agni in front, went up to the Asuras. The Asuras cut off the point of that flame held forward. It settled down on this earth, and became that krimuka tree: hence it is sweet, for there is vital essence (in it). Hence also it is red, for it is a flame, that krimuka tree being the same as this Agni: it is (in the shape of) fire that he imparts growth to it.