[Voxel]

Use SetPlayerTeam for your teams

pawn Code:

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid)
{
    if(GetPlayerTeam(playerid) == GetPlayerTeam(issuerid))
    {
        GameTextForPlayer(issuerid, "~r~Dont atack your team!", 2000, 6); return 0;    
    }
}