linguistic:paraphrasing, structural:scholar_edition, stylistic:tone
The first shloka

Valmiki was going to the river Ganges for his daily ablutions. A disciple by the name Bharadwaja was carrying his clothes. On the way, they came across the Tamasa Stream. Looking at the stream, Valmiki said to his disciple, "Look, how clear is this water, like the mind of a good man! I will bathe here today." When he was looking for a suitable place to step into the stream, he saw a crane couple mating. Valmiki felt very pleased on seeing the happy birds. Suddenly, hit by an arrow, the male bird died on the spot. Filled by sorrow, its mate screamed in agony and died of shock. Valmiki's heart melted at this pitiful sight. He looked around to find out who had shot the bird. He saw a hunter with a bow and arrows, nearby. Valmiki became very angry. His lips opened and he cried out,

मा निषाद प्रतिष्ठां त्वमगमः शाश्वतीः समाः। यत्क्रौञ्चमिथुनादेकमवधीः काममोहितम्॥' mā niṣāda pratiṣṭhā tvamagamaḥ śāśvatīḥ samāḥ yat krauñcamithunādekam avadhīḥ kāmamohitam You will find no rest for the long years of Eternity For you killed a bird in love and unsuspecting

Emerging spontaneously from Valmiki's rage and grief, this couplet is considered the first shloka in Sanskrit literature. Valmiki later composed the entire Ramayana in the same meter. Valmiki is revered as Adi Kavi (the first poet); the Ramayana is revered as the first kavya (poem).