I heard Abu Barza saying that the Messenger of Allah (ﷺ) did not mind some delay in the 'Isha' prayer even up to midnight and he did not like sleeping before (observing it) and talking after it. Shu'ba said: I again met him (Sayyar b. Salama) for the second time and he said: Even up to the third (part) of the night.
Reference: Sahih Muslim 647 b In-book : Book 5, Hadith 299 USC-MSA web (English) : Book 4, Hadith 1351 (deprecated)
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