Acts 21:5 (WEB)
When those days were over, we departed and went on our journey. They all, with wives and children, brought us on our way until we were out of the city. Kneeling down on the beach, we prayed.
Catechism · 1
“The first Christian communities lived this form of fellowship intensely.” — Catechism footnote: Cf. Acts 12:5; 20:36; 21:5; 2 Cor 9:14.
Fathers and councils · 2
First Council of Nicaea (325)
“All the churches did not, however, adopt this practice; for we see in the Acts of the Apostles (xx. 36 and xxi. 5) that St. Paul prayed kneeling during the time between Pentecost and Easter.” — the author cites it
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Jerome
“Next passing over the sands of Tyre on which Paul had once knelt she came to Acco or, as it is now called, Ptolemais, rode over the plains of Megiddo which had once witnessed the slaying of Josiah, and entered the land of the Philistines.” — editor's note: Acts xxi. 5.
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Cross-references · 1
Cited together in First Council of Nicaea, Canon 20.