"I am the most knowledgeable of people about the time of the 'Isha' prayer. The Prophet (ﷺ) used to pray it when the moon set on the third night of the month."
Sunan an-Nasa'i Book 6, Hadith 35
← Previous Hadith "Al-Hajjaj arrived, and we asked Jabir bin 'Abdullah, who said: 'The Messenger of Allah (ﷺ) prayed Zuhr at the time of intense heat, and 'Asr when the sun was white and clear, and Maghrib when the sun set, and with 'Isha' it would depend - if he saw that the people had gathered, he would pray early, and if he saw that they had not come yet, he would delay it.'"

Meaning, at the earliest time.

Sunan an-Nasa'i Book 6, Hadith 34 Next Hadith → "By Allah, I am the most knowledgeable of people about the time of the 'Isha' prayers. The Prophet (ﷺ) used to pray it when the moon set on the third night of the month."

Sunan an-Nasa'i Book 6, Hadith 36