Related for Bava Metzia 115:9

היה שכיר שבת שכיר חדש שכיר שנה שכיר שבוע נותנין לו שכר שבת לפיכך אחריות שבת עליו מאי לאו לשלם

or a child,<span class="x" onmousemove="('comment',' To prevent him from ritually defiling himself. The water for mixing with the ashes of the red heifer was drawn by a child, who had to be ritually clean. ');">¹⁷</span> or to watch over the crops,<span class="x" onmousemove="('comment',' This refers to the barley specially sown seventy days before Passover (Men. 85a) for the ceremony of 'sheaf waving' (Lev. XXIII, 11) and to the wheat of which the two 'wave loaves' were made on Pentecost (ibid. 17). These crops were specially guarded. ');">¹⁸</span>

Tosefta Shabbat