al-Tirmidhi (806) narrated that Abu Dharr (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said:
“Whoever prays qiyaam – i.e., Taraweeh – with the imam until he finishes, it will be recorded as if he spent the whole
night in prayer.”
Classed as saheeh by al-Albaani in Saheeh al-Tirmidhi. Irwa’ al-Ghaleel (447)
Shaykh Ibn ‘Uthaymeen (may Allah have mercy upon him) said,
“At first the Prophet (sal Allahu alaihi wa sallam) used to pray Taraweeh in congregation in the mosque, then he stopped because he feared that it might be made obligatory upon his ummah… No man should keep away from Taraweeh prayer lest he misses out on the reward for it. And he should not leave until the imam finishes Taraweeh and Witr, so that he may attain the reward of spending the whole night in prayer.”
Further Reading:
Great Rewards 
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