Kenya MP Moses Kuria has told the BBC he received a $1,000 (£700) bribe in parliament last year to back the appointment of the majority leader.
“It is not unusual for members to get this kind of an inducement,” he said, adding he would return the payment.
Mr Kuria made the remarks as he and two other colleagues are to be censured for alleging pay-outs were made to back a recent constitutional amendment bill.
Majority leader Amos Kimunya has denied that bribes are paid in parliament.
The BBC has asked Mr Kimunya to respond to Mr Kuria’s specific allegation but has not yet had a response.
Kenyan MPs are some of the best-paid lawmakers in the world – and officials estimate the East African nation loses billions of dollars every year to corruption.