Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: The Prophet (peace and blessings be upon him) and his Companions were swimming in a pond, and the Prophet (peace and blessings be upon him) said: "Let each man among you swim to his companion." So each man swam to his companion, and only the Prophet (peace and blessings be upon him) and Abu Bakr (may Allah be pleased with him) remained. Then the Prophet (peace and blessings be upon him) swam to Abu Bakr (may Allah be pleased with him) until he embraced him, and said: "I am to my companion, I am to my companion."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11626