Canonical version
When Bahá’u’lláh lived at Bahji \x96 and ‘Abdu’l-Bahá at Akka \x96
When Bahá’u’lláh lived at Bahji and ‘Abdu’l-Bahá at Akka the Master would visit His Father once a week. He liked to do this on foot and when asked why He did not ride to Bahji He responded by asking, ‘ who am I that I should ride where the Lord Christ walked?’ However, His Father requested Him to ride, so in order to comply the Master rode out of Akka, but when He sighted Bahá’u’lláh’s Mansion, He dismounted. Bahá’u’lláh used to watch for His approach from His second-floor window and as soon as He saw Him coming. He would joyously tell His family to go out to meet Him.
Source: Honnold, Annamarie, Vignettes from the Life of ‘Abdu’l-Bahá
Collected from bahaistories.com (Subject: selfless).