The Bab Abi Bakr al-Siddique (باب ابو بكر الصديق), was originally a small door near where the house of companion Abu Bakr was located in Medina. This small gate was called "Khokha Abu Bakr" (خوخه ابو بكر), and was located near the fifth column west of the Minbar Nabawi.
According to ibn Hajr “Small door is called Khukhah” it was near the fifth column west of the pulpit. This small door opened into the mosque. This door was moved westward along the same line during the various expansions of the mosque. During the first expansion by the Saudi Government, it was named Bab Siddique. This gate allows direct access to the Ottman Prayer Hall.
It is located north of Bab as-Salam and south of Bab al-Rehmah, on the western side of the Ottoman prayer hall of the Masjid an-Nabawi. It has three access portals, topped with three arches, adorned with four pairs of columns in front.
Khokha or Khukhah Abi Bakr (خوخة أبي بكر), is the smaller, now inner, gate of Masjid an-Nabawi. Khokha (خَوْخَة) is a small door or gate especially beside or in a larger one used to close only the lower part of a doorway or a window between two building. It is believed that the house of Abu Bakr al-Siddique was located either at this place or somewhere closeby.
Next to the Bab abu Bakr Siddique is Bab al-Rehmah (gate of Mercy). Unlike other entrances of Masjid Nabawi, the Gate of Abu Bakr is quite simple and has no calligraphic inscriptions over it. Current structure of this gate, which is named after the first caliph Abu Bakr, dates back to the first Saudi expansion of the prophet's mosque.