World Wide Study Bible
a Bible passage
28. Was returning—Having come so far, he not only stayed out the days of the festival, but prolonged his stay till now. It says much for his fidelity and value to his royal mistress that he had such liberty. But the faith in Jehovah and love of His worship and word, with which he was imbued, sufficiently explain this.
and sitting in his chariot, read Esaias—Not contented with the statutory services in which he had joined, he beguiles the tedium of the journey homeward by reading the Scriptures. But this is not all; for as Philip "heard him read the prophet Esaias," he must have been reading aloud and not (as is customary still in the East) so as merely to be audible, but in a louder voice than he would naturally have used if intent on his own benefit only: evidently therefore he was reading to his charioteer.