It has been called through a series of memoirs that Imam, who raised flag of Islamic values and revived divine teachings in recent history, had great devotion for the spiritual perfection.
Imam used to perform prayer at its exact time and never delayed for a moment and consumed much of his time in reciting Quran and supplications.
Imam never gave up such good practices through thick or thin times even when he was hospitalized during last weeks of his life.
The leader of the Islamic Revolution used to quote a narration by Imam Sadiq (PBUH) who said “those who take their prayers light will not be blessed with our intercession”.
(Source: A journey to Imam Khomeini’s mysticism, memoirs by Dr. Fatima Tabataba’ei, Imam’s daughter-in –law)