In one of the answers, it was mentioned as follows:
येषामीशे पशुपतिः पशूनां चतुष्पदामुत च द्विपदम् ।। [YajurVeda 3.1.4]
Which Pashus do the Pashupati rules? He rules both the two footed and four footed.
A forerunner for this concept is available in Rig Veda I.114.1 & 9, dedicated to Rudra, in a subtle manner.
इ॒मा रु॒द्राय॑ त॒वसे॑ कप॒र्दिने॑ क्ष॒यद्वी॑राय॒ प्र भ॑रामहे म॒तीः ।
यथा॒ शमस॑द् द्वि॒पदे॒ चतु॑ष्पदे॒ विश्वं॑ पु॒ष्टं ग्रामे॑
These poetic thoughts do we proffer to Rudra, the powerful one with
braided hair who rules over heroes, so that he will be luck for our
two-footed and four-footed, so that everything in this settlement
will be flourishing, free of affliction.
In the mantra 9 of the same Hymn, the poet describes himself as cowherd - पशु॒पा, indicating that the owner is Rudra, an epithet of the Almighty.
उप॑ ते॒ स्तोमा॑न् पशु॒पा इ॒वाक॑रं॒ रास्वा॑ पितर्मरुतां
सु॒म्नम॒स्मे । भ॒द्रा हि ते॑ सुम॒तिर्मृ॑ळ॒यत्त॒माथा॑ व॒यमव॒ इत्ते॑
Like a cowherd, I have driven these praises close to you. Grant your favor to us, father of the Maruts, for your benevolence is
auspicious, most merciful. It is just your aid that we choose.