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Allah's Messenger (ﷺ) said:
"The closest that the Lord comes to the slave is in the last portion of the night. So, if you are able to be among those who remember Allah in this hour, then be among them."
Reference:
At-Tirmidhi, An-Nasa'i 1/279 and Al-Hakim. See also Al-Albani, Sahih
At-Tirmidhi 3/183, and Jdmi'ul-'Usool with Al-Arna'ut's checking 4/144.