How Important is it to Study the O.T.?-Matt.24

"It is written"/"Have ye not read?"
Matt.4:4/Lk.4:4=Deut.8:3
Matt.4:7/Lk.4:8=Deut.6:16
Matt.4:10/Lk.4:12=Deut.6:13/10:20
Lk.4:18-19=Isa.61:1-2
Lk.10:26*
Matt.11:10=Mal.3:1
Matt.12:3/Mk.2:25=1Sam.21:6
Matt.12:5=Num.28:9-10
Matt.12:6=Hos.6:6
Lk.18:31*
Mk.7:6-7=Isa.29:13/Ex.20:21:17
Mk.9:12-13=Mal.4
John6:31=Ps.78:24
John6:45=Isa.54:13(Jer.31:34)
John7:38=Isa.12:3
John8:17=Deut.19:15
Matt.19:4=Gen.1:27/2:24
John10:34=Ps.82:6
John13:18=Ps.41:9
John15:25=Ps.35:19/69:4
Matt.21:13/Mk.11:17/Lk.19:46=Isa.56:7/Jer.7:11
Matt.21:16=Ps.8:2
Matt.21:42/Mk.12:10-11/Lk.20:17=Ps.118:22
Matt.22:31/Mk.12:26=Ex.3:2-6
Lk.21:22=Isa.61:2/Hos.9:7
Matt.24:15/Mk.13:14*
Lk.22:37=Isa.53:12
John17:12=Eze.28:18-19
John19:28=Ps.69:1
Matt.26:31/Mk.14:27=Zech.13:7
Matt.26:54=Isa.53:7
Lk.24:25-27*