At the Battle of Kuruksetra, Lord Krsna touched the feet of Maharaja Yudhisthira because the King was His elder

Expressions researched:
"at the Battle of Kurukṣetra, Lord Kṛṣṇa touched the feet of Mahārāja Yudhiṣṭhira because the King was His elder"

Srimad-Bhagavatam

SB Canto 4

Thus although Lord Viṣṇu is the Supreme Personality of Godhead, He offered His respects to Kaśyapa Muni. Similarly, when Lord Kṛṣṇa was a child He used to offer His respectful obeisances to His mother and father, Nanda and Yaśodā. Also, at the Battle of Kurukṣetra, Lord Kṛṣṇa touched the feet of Mahārāja Yudhiṣṭhira because the King was His elder.

SB 4.6.39, Translation and Purport

Lord Śiva's lotus feet were worshiped by both the demigods and demons, but still, in spite of his exalted position, as soon as he saw that Lord Brahmā was there among all the other demigods, he immediately stood up and offered him respect by bowing down and touching his lotus feet, just as Vāmanadeva offered His respectful obeisances to Kaśyapa Muni.

Kaśyapa Muni was in the category of the living entities, but he had a transcendental son, Vāmanadeva, who was an incarnation of Viṣṇu. Thus although Lord Viṣṇu is the Supreme Personality of Godhead, He offered His respects to Kaśyapa Muni. Similarly, when Lord Kṛṣṇa was a child He used to offer His respectful obeisances to His mother and father, Nanda and Yaśodā. Also, at the Battle of Kurukṣetra, Lord Kṛṣṇa touched the feet of Mahārāja Yudhiṣṭhira because the King was His elder. It appears, then, that the Personality of Godhead, Lord Śiva and other devotees, in spite of their being situated in exalted positions, instructed by practical example how to offer obeisances to their superiors. Lord Śiva offered his respectful obeisances to Brahmā because Brahmā was his father, just as Kaśyapa Muni was the father of Vāmana.