有凭有据 Origin — Chinese Character Wiki

yǒupíngyǒujù

well-founded

有 yǒu verb

to have

to have; to possess; to include; to carry (a trait or quality)
凭憑 píng noun

[evidence]

(bound form) evidence; proof; testimony
有 yǒu verb

to have

to have; to possess; to include; to carry (a trait or quality)
据據 jù noun

proof

(bound form) evidence; certificate; a written proof such as a receipt or voucher