Liberia, a nation founded by freed American slaves, is seeing its first democratic transfer of power in more than 70 years as Africa's first female president, Nobel Peace Prize victor Ellen Johnson Sirleaf, steps aside.
Weah adds that "we have a lot to do together to accelerate the building of tomorrow's Africa".
"Those chosen to serve will and must be dedicated to the ideas of grassroots social transformation. persons looking to treat the Liberian people through menace of corruption will have no place in this administration", Weah said.
Vice chairman of the MTN FA Cup Committee, Kofi Poku has given the clearest indication that former Ballon d'Or victor; George Oppong Weah deserves to be the president of Liberia.
He beat Vice President Joseph Boakai, who took 38.5% of the vote.
"Weah also paid tribute to Boakai, calling him 'a statesman and neighbor". He also called for foreign investments as the flow of aid to Liberia is in decline.
Weah made the promise while delivering his victory speech at his party's headquarters in Monrovia on Saturday.
Mr Weah, 51, grew up in poverty in Liberia.
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Buhari says Nigeria is ready to work with Liberia on issues of mutual interest and called Weah's victory "an affirmation of the will of the Liberian people to remain united, peaceful and prosperous".
French President Emmanuel Macron has called Liberia's president-elect George Weah to congratulate him and invite him to visit.
Liberia's vice president is congratulating former worldwide soccer star George Weah on winning the West African nation's presidency.
Though hundreds sang his praises and chanted his name at the end of his speech, Weah did not mention how he intends to tackle the country's economic woes, nor did he announce specific programs to address unemployment.
In addition to corruption, Liberia faces problems with electricity and a health care system decimated by the Ebola outbreak.
This is the second time he has run for the presidency in Liberia, the first being in 2005.
He has been senator for Montserrado County in Liberia after being elected in 2014.
He promised to build his administration on the institutional gains made under Ellen Johnson Sirleaf's administration and improve the lives of the people, protect rights and foster inclusion.