ומנחתם ונסכיהם לפרים לאלים ולכבשים במספרם כמשפט
Simply, v’niskeihem, “and their libations,” refers to the libations of the two sheep of the Korban Tamid, one in the morning and one in the afternoon. Chazal (Taanis 2b) note the Torah twice departs from the singular form, v’niska, which is used in five pesukim, one time in the above pasuk, where it is spelled v’niskeihem, in the plural (with an added “mem” at the end of the word). Also, in pasuk 31, the Torah writes U’nesachecha with an added yud. To add to the equation, we note the word k’mishpatam (pasuk 33), while it says k’mishpat throughout the pesukim….