30 top cited BG verses from his purports, lectures, conversation and letters. Based on a Vedabase search. A search in the current release of VB would give somewhat different figures.

01 – 18.66 sarva-dharman parityajya… cited = 1,320
02 – 02.13 dehino ‘smin yatha dehe… cited = 738
03 – 04.9 janma karma ca me divyam… cited = 733
04 – 07.19 bahunam janmanam ante… cited = 622
05 – 07.14 daivi hy esa guna-mayi… cited = 582
06 – 18.54 brahma-bhutah prasannatma… cited = 529
07 – 07.15 na mam duskrtino mudhah.. cited = 497
08 – 03.27 prakrteh kriyamanani… cited = 489
09 – 18.61 isvarah sarva-bhutanam… cited = 488
10 – 15.15 sarvasya caham hrdi sannivisto… cited = 487
11 – 18.65 man-mana bhava mad-bhakto… cited = 451
12 – 10.8 aham sarvasya prabhavo… cited = 431
13 – 13.8-12 amanitvam adambhitvam… cited = 397
14 – 02.20 na jayate mriyate va kadacin… cited = 384
15 – 05.29 bhoktaram yajna-tapasam… cited = 356
16 – 09.10 mayadhyaksena prakrtih… cited = 354
17 – 18.55 bhaktya mam abhijanati… cited = 338
18 – 07.3 manusyanam sahasresu… cited = 335
19 – 04.13 catur-varnyam maya srstam… cited = 334
20 – 04.2 evam parampara-praptam… cited = 325
21 – 09.11 avajananti mam mudha… cited = 315
22 – 04.7 yada yada hi dharmasya… cited = 310
23 – 07.7 mattah parataram nanyat… cited = 301
24 – 04.8 paritranaya sadhunam… cited = 297
25 – 10.12-13 param brahma param dhama… cited = 282
26 – 09.26 patram puspam phalam toyam… cited = 275
27 – 15.7 mamaivamso jiva-loke… cited = 274
28 – 14.4 sarva-yonisu kaunteya… cited = 273
29 – 07.4 bhumir apo ‘nalo vayuh… cited = 261
30 – 04.34 tad viddhi pranipatena… cited = 256