Mother Yasoda told Krsna: My dear son, because of playing all day, Your body has become covered with dust and sand. Therefore, come back, take Your bath and cleanse Yourself - SB 10.11.18

Expressions researched:
"Mother Yaśodā further told Kṛṣṇa: My dear son, because of playing all day, Your body has become covered with dust and sand. Therefore, come back, take Your bath and cleanse Yourself"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Mother Yaśodā further told Kṛṣṇa: My dear son, because of playing all day, Your body has become covered with dust and sand. Therefore, come back, take Your bath and cleanse Yourself.

SB 10.11.18, Translation and Purport

Mother Yaśodā further told Kṛṣṇa: My dear son, because of playing all day, Your body has become covered with dust and sand. Therefore, come back, take Your bath and cleanse Yourself. Today the moon is conjoined with the auspicious star of Your birth. Therefore, be pure and give cows in charity to the brāhmaṇas.

It is a custom of Vedic culture that whenever there is any auspicious ceremony, one should give valuable cows in charity to the brāhmaṇas. Therefore mother Yaśodā requested Kṛṣṇa, "Instead of being enthusiastic in playing, now please come and be enthusiastic in charity." Yajña-dāna-tapaḥ-karma na tyājyaṁ kāryam eva tat. As advised in Bhagavad-gītā (BG 18.5), sacrifice, charity and austerity should never be given up. Yajño dānaṁ tapaś caiva pāvanāni manīṣiṇām: even if one is very much advanced in spiritual life, one should not give up these three duties. To observe one's birthday ceremony, one should do something in terms of one of these three items (yajña, dāna or tapaḥ), or all of them together.