The line you provided — “Umawit ang bayan ng poong mahal” — appears to be from a , possibly a hymn or a lyric referencing the nation singing in praise of a beloved Lord (“Poong Mahal” = beloved Lord/God).
If you need a or a stanza in the same reverent style, here is a possible piece: Umawit ang bayan ng Poong Mahal, Sa puso’t diwa’y Si’yang kapiling natin. Ang lupa’t langit ay magpupuri, Sa Kanyang awa’t dakilang pag-ibig. If you meant to identify the source of your line, it may be from a Filipino liturgical song , a Pasyon verse, or a folk religious lyric — not from the national anthem or a major commercial song. Could you share more context so I can give a more precise answer? umawit ang bayan ng poong mahal