Q: When is Laylatul Qadr ( Night of decree )19, 21,or 23? Why is the 23 the strongest narration?
A: The strongest Hadith is for the 23. Main reason being:
"Ali is with the Quran and Quran is with Ali,"
Imam Ali was assassinated on the 19, he died on the 21st.
It takes 3 days for the soul to depart fully from this realm.
From 21-23 is 3 days.
The Quran with Ali ascended the same night it descended.