God used miracles wonders and signs in Israel to attest to Jesus as the Christ.
mir•a•cle \ˈmir-i-kəl\ noun
[Middle English, from Anglo-French, from Late Latin miraculum, from Latin, a wonder, marvel, from mirari to wonder at] 12th century
1: an extraordinary event manifesting divine intervention in human affairs
2: an extremely outstanding or unusual event, thing, or accomplishment
3 Christian Science: a divinely natural phenomenon experienced humanly as the fulfillment of spiritual law
5059 τέρας [teras /ter·as/] n n. Of uncertain affinity; TDNT 8:113; TDNTA 1170; GK 5469; 16 occurrences; AV translates as “wonder” 16 times. 1 a prodigy, portent. 2 miracle: performed by any
4592 σημεῖον [semeion /say·mi·on/] n n. From a presumed derivative of the base of 4591; TDNT 7:200; TDNTA 1015; GK 4956; 77 occurrences; AV translates as “sign” 50 times, “miracle” 23 times, “wonder” three times, and “token” once. 1 a sign, mark, token. 1A that by which a person or a thing is distinguished from others and is known. 1B a sign, prodigy, portent, i.e. an unusual occurrence, transcending the common course of nature. 1B1 of signs portending remarkable events soon to happen. 1B2 of miracles and wonders by which God authenticates the men sent by him, or by which men prove that the cause they are pleading is God’s.