PURPORT

As stated in the previous verse, Lord Brahma was accompanied by other demigods, but his specific carrier was the great swan. Therefore as soon as Narada Muni saw the swan, he could understand that his father, Lord Brahma, who is also known as Hiranyagarbha, was arriving. Thus he immediately stood up with Svayambhuva Manu and his son Priyavrata to receive Lord Brahma and offer him respect.