Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 8
Sanskrit:
बिभर्ति क्वचिदाज्ञप्त: पीठकोन्मानपादुकम् ।बाहुक्षेपं च कुरुते स्वानां च प्रीतिमावहन् ॥ ८ ॥
ITRANS:
bibharti kvacid ājñaptaḥpīṭhakonmāna-pādukambāhu-kṣepaṁ ca kurutesvānāṁ ca prītim āvahan
Translation:
Sometimes mother Yaśodā and her gopī friends would tell Kṛṣṇa, “Bring this article” or “Bring that article.” Sometimes they would order Him to bring a wooden plank, wooden shoes or a wooden measuring pot, and Kṛṣṇa, when thus ordered by the mothers, would try to bring them. Sometimes, however, as if unable to raise these things, He would touch them and stand there. Just to invite the pleasure of His relatives, He would strike His body with His arms to show that He had sufficient strength.