Shiva Purana

siva.sh/siva-purana/saturda-samhita/1/28

अथास्य पार्श्वतः कृष्णाः कृष्णस्नानानुलेपनाः।। चत्वारस्तु महात्मानः संबभूवुः कुमारकाः।।२८।।

sanskrit

Then from his sides sprang up four noble-souled sons all of whom were black in colour and had black toilet and unguent articles.

english translation

athAsya pArzvataH kRSNAH kRSNasnAnAnulepanAH|| catvArastu mahAtmAnaH saMbabhUvuH kumArakAH||28||

hk transliteration by Sanscript