Lord Kṛṣṇa begged pardon from His parents for Their [Kṛṣṇa and Balarāma’s] inability to serve their feet, due to being away from home because of great fear of Kaṁsa. He said, “O mother, O father, please excuse Us for this inability.” All this behavior of the Lord gives me pain at heart.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
दुनोति चेतः स्मरतो ममैत- द्यदाह पादावभिवन्द्य पित्रोः । ताताम्ब कंसादुरुशङ्कितानां प्रसीदतं नोऽकृतनिष्कृतीनाम्
dunoti cetaḥ smarato mamaita- dyadāha pādāvabhivandya pitroḥ | tātāmba kaṃsāduruśaṅkitānāṃ prasīdataṃ no'kṛtaniṣkṛtīnām
SB 3.2.17