Rashi on Leviticus 1:3/רש"י על ויקרא א׳:ג׳

1זכר A MALE, but not a female. When Scripture mentions again lower down. (v. 10) that the sacrifice shall be זכר, a male, — which appears unnecessary to state, — it intends to say: a male, but not an animal whose sex is indeterminate or which is a hermaphrodite (Sifra, Vayikra Dibbura d'Nedavah, Section 3 9; Bekhorot 41b).

2תמים means WITHOUT BLEMISH,

3אל פתח אהל מועד [HE SHALL BRING IT NEAR] UNTO THE ENTRANCE OF THE APPOINTED TENT — He himself must attend to bringing it right up to the forecourt (where it is handed over to the priests). What is the force of Scripture using the term יקריב twice (יקריבנו and יקריב אתו; it might suffice to say:‎תמים זכר ‎'יקריבנו אל פתח אהל מועד לרצונו וכו‎)?! It is intended to intimate that even in case the burnt offering of Reuben has become mixed up with that of Simeon so that they cannot be identified, nevertheless each must bring one of the animals to the forecourt on behalf of him to whom it really belongs). Similarly if a burnt offering has been mixed up with non-consecrated animals, the non — consecrated ones must be sold for עולה purposes (they are sold to people who have voluntarily undertaken to offer an עולה), and thus all of them become burnt offerings and each is now brought on behalf of him to whom it belongs (cf. Mishna Zevachim 8:1). One might think that this must also be done if it (an animal intended to be a burnt offering) became mixed up with animals unfit for sacrifice (with those mentioned above as excluded from the category of sacrifices) or with a different kind of sacrifices (e.g., peace — offerings)! Scripture. however, states,יקריבנו, “he shall bring it) (Sifra, Vayikra Dibbura d'Nedavah, Section 3 13).

4יקריב אתו HE SHALL OFFER IT — This apparently superfluous word (אתו) teaches us that they (the בי"ד) must put pressure upon him to bring it if he is remiss in bringing the sacrifice he had promised. One might think that this means that they shall force him against his will! Scripture, however, states, לרצונו “[he must bring it] so that it shall be favourably accepted for him”. How is this possible? They press him until he says, “I wish to do it” (Sifra, Vayikra Dibbura d'Nedavah, Section 3 15).

5‎'לפני ה‎ וסמך [HE SHALL OFFER] IT …] BEFORE THE LORD (4) AND HE SHALL LAY [HIS HAND UPON THE HEAD OF THE SACRIFICE] - This implies that there is no "laying of hands" upon an animal sacrifice on a private "high place" (במה; at the time when sacrifice was permissible on such) (Sifra, Vayikra Dibbura d'Nedavah, Chapter 4 1)