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I have always been told that Miriam and Aaron were older siblings of Moses. I've seen the same thing on Wikipedia:

Miriam (Hebrew: מִרְיָם‎ Mīrəyām) was described in the Hebrew Bible as the daughter of Amram and Jochebed, and the older sister of Moses and Aaron. She was a prophetess and first appears in the Book of Exodus.

Is it written literally in the bible, or it's a tradition only?

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Is it written literally in the bible that Miriam and Aaron were older siblings of Moses?

Yes, Miriam and Aaron are brother and sister to Moses:

And the name of Amʹram’s wife was Jochʹe·bed, Leʹvi’s daughter, whom his wife bore to Leʹvi in Egypt. And to Amʹram she bore Aaron and Moses and their sister Mirʹi·am. (Nu 26:59)

1 The sons of Leʹvi were Gerʹshon, Koʹhath, and Me·rarʹi. 2 The sons of Koʹhath were Amʹram, Izʹhar, Hebʹron, and Uzʹzi·el. 3 The children of Amʹram were Aaron, Moses, and also Mirʹi·am. And the sons of Aaron were Naʹdab, A·biʹhu, El·e·aʹzar, and Ithʹa·mar. (1Ch 6:1-3)

Miriam is older than Moses:

1 About that time, a certain man of the house of Leʹvi married a daughter of Leʹvi. 2 And the woman became pregnant and gave birth to a son. When she saw how beautiful he was, she kept him concealed for three months. 3 When she was no longer able to conceal him, she took a papyrus basket and coated it with bitumen and pitch and put the child in it and placed it among the reeds by the bank of the Nile River. 4 But his sister stood at a distance to see what would happen to him. (Ex 2:1-4) [bold mine]

And Aaron is older than Moses:

Moses was 80 years old and Aaron was 83 years old when they spoke to Pharʹaoh. (Ex 7:7)

[All scripture quotations from the New World Translation of the Holy Scriptures (Study Edition)]

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