Lord Rudra as everyone and everything.

tvaṃ strī pumān asi
tvaṃ kumāra uta vā kumārī
tvaṃ jīrṇo daṇḍena vañcasi
tvaṃ jāto bhavasi viśvato-mukhaḥ ( SV Up IV-3)

Meaning: Thou art a woman, and a man; thou art a damsel and a boy. Grown old thou totterest with a staff, new-born thou lookest every way.

The above verse describes Lord Rudra as everyone and everything. But this verse is adapted from the Skambha Suktam of Atharvana Veda samhita. 'Skambha' means 'pillar'. Lord Rudra appeared as pillar without beginning or ending. Both Hari and Brahma failed to know the origin and end of skambha. 'Linga' is a symbol of Skambha.

Adapted From:

tváṃ strī́ tváṃ púmān asi tváṃ kumārá utá vā kumārī́||
tváṃ jīrṇó daṇḍéna vañcasi tváṃ jātó bhavasi viśvátomukhaḥ (Atharva Veda Śamhita 10,8.27)

Om Namah Shivay.