Opposition leader Benjamin Netanyahu was released from hospital on Thursday after a health scare had kept him overnight for observation, the Shaare Zedek Medical Center said in a statement.
The 72-year old Netanyahu was hospitalized after feeling ill during Yom Kippur services in a Jerusalem synagogue.
"After undergoing medical tests, he was found in good health and returned to his full schedule," his office said.
The Likud leader "is already on his morning walk," the office said.
Netanyahu thanked hospital chief Professor Ofer Marin, the medical team and Dr. Amir Orlev the hospital's chief of cardiology.
Netanyahu is said to have collapsed during his fast on the Day of Atonement. He underwent medical tests, including a CT scan, and was kept for observation in the hospital's intensive care unit. The hospital said on Wednesday that the opposition leader who was feeling unwell arrived independently to the medical center.
Prime Minister Yair Lapid posted his well-wishes to Netanyahu on his Twitter feed.
Netanyahu is in the midst of a contentious election campaign, the fifth in three years, hoping to regain power after he was ousted as prime minister in 2021.
Just three weeks ahead of the November 1 ballot, polls show he may again fall short of the 61-seat Knesset support he will need to form a coalition government.
He is also on trial for bribery, fraud and breach of trust in a Jerusalem court, charges he denies.